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| Keywords: bookid:relicsofprimeval1897daws bookidrelicsofprimeval1897daws bookyear:1897 bookyear1897 bookdecade:1890 bookdecade1890 bookcentury:1800 bookcentury1800 bookauthor:dawson__john_william__sir__1820_1899 bookauthordawsonjohnwilliamsir18201899 bookpublisher:n_y__revell bookpublishernyrevell bookcontributor:harvard_university__museum_of_comparative_zoology__ernst_mayr_library bookcontributorharvarduniversitymuseumofcomparativezoologyernstmayrlibrary booksponsor:harvard_university__museum_of_comparative_zoology__ernst_mayr_library booksponsorharvarduniversitymuseumofcomparativezoologyernstmayrlibrary bookleafnumber:46 bookleafnumber46 bookcollection:biodiversity bookcollectionbiodiversity bhl collection bhlcollection bhl consortium bhlconsortium drawing text illustration bookid:relicsofprimeval1897daws bookidrelicsofprimeval1897daws bookyear:1897 bookyear1897 bookdecade:1890 bookdecade1890 bookcentury:1800 bookcentury1800 bookauthor:dawson__john_william__sir__1820_1899 bookauthordawsonjohnwilliamsir18201899 bookpublisher:n_y__revell bookpublishernyrevell bookcontributor:harvard_university__museum_of_comparative_zoology__ernst_mayr_library bookcontributorharvarduniversitymuseumofcomparativezoologyernstmayrlibrary booksponsor:harvard_university__museum_of_comparative_zoology__ernst_mayr_library booksponsorharvarduniversitymuseumofcomparativezoologyernstmayrlibrary bookleafnumber:46 bookleafnumber46 bookcollection:biodiversity bookcollectionbiodiversity bhl collection bhlcollection bhl consortium bhlconsortium drawing text illustration Identifier: relicsofprimeval1897daws Title: Relics of primeval life, beginning of life in the dawn of geological time Year: 1897 (1890s) Authors: Dawson, John William, Sir, 1820-1899 Subjects: Publisher: N.Y. Revell Contributing Library: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library Digitizing Sponsor: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library View Book Page: Book Viewer About This Book: Catalog Entry View All Images: All Images From Book Click here to view book online to see this illustration in context in a browseable online version of this book. Text Appearing Before Image: divided. These creaturesare indeed remarkable for the twofold property ofbilateral symmetry, and fore and aft jointed structure,both based on the number three. From front torear we have a large head, usually with well-devel-oped eyes and oral organs, a middle or thoracicpart composed of a series of movable segments, anda tail-piece sometimes small, sometimes nearly aslarge as the head. Transversely, the body is dividedinto a central and two lateral lobes, which can beseen in the head, the thorax, and usually in thetail as well. The organization of these animalsmust have been as complex as that of most existingCrustaceans. Their nerve system must have beenwell developed; a vast number of muscles wererequired to move the different parts of the trunk,and the numerous and complex limbs which havebeen observed in some of the species, and no doubtwere possessed by all. Their digestive and circu-latory organs must have been in proportion to thecomplexity of their locomotive organs. Figure 2, Text Appearing After Image: Fig. z. — Triarthriis Becki, Green.A Trilobite of primitive type, showing its limbs and antennae. (After Beecher.) 23 LIFE IN THE EARLY CAMBRIAN 25 borrowed from Beecher,^ shows the limbs of aspecies, not of the Lower Cambrian, but of a some-what later formation. There can be no doubt, how-ever, that those of earlier species were equally per-fect, more especially as Triarthrus is an animal of anold type approaching to extinction in the age suc-ceeding the Cambrian, and its representatives in theearlier and palmy days of the family could nothave been inferior in organization. These creaturesswarmed in every sea in the Cambrian period,and were represented by a great number of spe-cies, some of them of large size, others very small;some many - jointed, others few - jointed, and witha great variety of tubercles, spines, and other orna-mental and protective parts. If we ask for theiraffinities and place in the great group of Crustacea,the answer must be that, while in some points alliedt Note About Images Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work. Identifier: relicsofprimeval1897daws Title: Relics of primeval life, beginning of life in the dawn of geological time Year: 1897 (1890s) Authors: Dawson, John William, Sir, 1820-1899 Subjects: Publisher: N.Y. Revell Contributing Library: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library Digitizing Sponsor: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library View Book Page: Book Viewer About This Book: Catalog Entry View All Images: All Images From Book Click here to view book online to see this illustration in context in a browseable online version of this book. Text Appearing Before Image: divided. These creaturesare indeed remarkable for the twofold property ofbilateral symmetry, and fore and aft jointed structure,both based on the number three. From front torear we have a large head, usually with well-devel-oped eyes and oral organs, a middle or thoracicpart composed of a series of movable segments, anda tail-piece sometimes small, sometimes nearly aslarge as the head. Transversely, the body is dividedinto a central and two lateral lobes, which can beseen in the head, the thorax, and usually in thetail as well. The organization of these animalsmust have been as complex as that of most existingCrustaceans. Their nerve system must have beenwell developed; a vast number of muscles wererequired to move the different parts of the trunk,and the numerous and complex limbs which havebeen observed in some of the species, and no doubtwere possessed by all. Their digestive and circu-latory organs must have been in proportion to thecomplexity of their locomotive organs. Figure 2, Text Appearing After Image: Fig. z. — Triarthriis Becki, Green.A Trilobite of primitive type, showing its limbs and antennae. (After Beecher.) 23 LIFE IN THE EARLY CAMBRIAN 25 borrowed from Beecher,^ shows the limbs of aspecies, not of the Lower Cambrian, but of a some-what later formation. There can be no doubt, how-ever, that those of earlier species were equally per-fect, more especially as Triarthrus is an animal of anold type approaching to extinction in the age suc-ceeding the Cambrian, and its representatives in theearlier and palmy days of the family could nothave been inferior in organization. These creaturesswarmed in every sea in the Cambrian period,and were represented by a great number of spe-cies, some of them of large size, others very small;some many - jointed, others few - jointed, and witha great variety of tubercles, spines, and other orna-mental and protective parts. If we ask for theiraffinities and place in the great group of Crustacea,the answer must be that, while in some points alliedt Note About Images Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work. Identifier: relicsofprimeval1897daws Title: Relics of primeval life, beginning of life in the dawn of geological time Year: 1897 (1890s) Authors: Dawson, John William, Sir, 1820-1899 Subjects: Publisher: N.Y. Revell Contributing Library: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library Digitizing Sponsor: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library View Book Page: Book Viewer About This Book: Catalog Entry View All Images: All Images From Book Click here to view book online to see this illustration in context in a browseable online version of this book. Text Appearing Before Image: divided. These creaturesare indeed remarkable for the twofold property ofbilateral symmetry, and fore and aft jointed structure,both based on the number three. From front torear we have a large head, usually with well-devel-oped eyes and oral organs, a middle or thoracicpart composed of a series of movable segments, anda tail-piece sometimes small, sometimes nearly aslarge as the head. Transversely, the body is dividedinto a central and two lateral lobes, which can beseen in the head, the thorax, and usually in thetail as well. The organization of these animalsmust have been as complex as that of most existingCrustaceans. Their nerve system must have beenwell developed; a vast number of muscles wererequired to move the different parts of the trunk,and the numerous and complex limbs which havebeen observed in some of the species, and no doubtwere possessed by all. Their digestive and circu-latory organs must have been in proportion to thecomplexity of their locomotive organs. Figure 2, Text Appearing After Image: Fig. z. — Triarthriis Becki, Green.A Trilobite of primitive type, showing its limbs and antennae. (After Beecher.) 23 LIFE IN THE EARLY CAMBRIAN 25 borrowed from Beecher,^ shows the limbs of aspecies, not of the Lower Cambrian, but of a some-what later formation. There can be no doubt, how-ever, that those of earlier species were equally per-fect, more especially as Triarthrus is an animal of anold type approaching to extinction in the age suc-ceeding the Cambrian, and its representatives in theearlier and palmy days of the family could nothave been inferior in organization. These creaturesswarmed in every sea in the Cambrian period,and were represented by a great number of spe-cies, some of them of large size, others very small;some many - jointed, others few - jointed, and witha great variety of tubercles, spines, and other orna-mental and protective parts. If we ask for theiraffinities and place in the great group of Crustacea,the answer must be that, while in some points alliedt Note About Images Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work. Identifier: relicsofprimeval1897daws Title: Relics of primeval life, beginning of life in the dawn of geological time Year: 1897 (1890s) Authors: Dawson, John William, Sir, 1820-1899 Subjects: Publisher: N.Y. Revell Contributing Library: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library Digitizing Sponsor: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library View Book Page: Book Viewer About This Book: Catalog Entry View All Images: All Images From Book Click here to view book online to see this illustration in context in a browseable online version of this book. Text Appearing Before Image: divided. These creaturesare indeed remarkable for the twofold property ofbilateral symmetry, and fore and aft jointed structure,both based on the number three. From front torear we have a large head, usually with well-devel-oped eyes and oral organs, a middle or thoracicpart composed of a series of movable segments, anda tail-piece sometimes small, sometimes nearly aslarge as the head. Transversely, the body is dividedinto a central and two lateral lobes, which can beseen in the head, the thorax, and usually in thetail as well. The organization of these animalsmust have been as complex as that of most existingCrustaceans. Their nerve system must have beenwell developed; a vast number of muscles wererequired to move the different parts of the trunk,and the numerous and complex limbs which havebeen observed in some of the species, and no doubtwere possessed by all. Their digestive and circu-latory organs must have been in proportion to thecomplexity of their locomotive organs. Figure 2, Text Appearing After Image: Fig. z. — Triarthriis Becki, Green.A Trilobite of primitive type, showing its limbs and antennae. (After Beecher.) 23 LIFE IN THE EARLY CAMBRIAN 25 borrowed from Beecher,^ shows the limbs of aspecies, not of the Lower Cambrian, but of a some-what later formation. There can be no doubt, how-ever, that those of earlier species were equally per-fect, more especially as Triarthrus is an animal of anold type approaching to extinction in the age suc-ceeding the Cambrian, and its representatives in theearlier and palmy days of the family could nothave been inferior in organization. These creaturesswarmed in every sea in the Cambrian period,and were represented by a great number of spe-cies, some of them of large size, others very small;some many - jointed, others few - jointed, and witha great variety of tubercles, spines, and other orna-mental and protective parts. If we ask for theiraffinities and place in the great group of Crustacea,the answer must be that, while in some points alliedt Note About Images Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work. | ||||
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