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| Keywords: The Quarterly journal of the Geological Society of London (12981157933).jpg 376 <br> PROCEEDINGS OF THE GEOLOGICAL SOCIETY DeC 1 <br> PiLocEEAs gen nov <br> A broad conical and slightly curved shell subcylindrical or <br> compressed Siphuncle and septa combined as a series of conical <br> concave septa which fit into each other sheathwise <br> PiLOCEEAS rsrvAGiNATUM spcc nov <br> PI XIII figs 17-21 ; and Woodcut fig 7 c <br> P 5 uncias longum conicum subcurvum ore ovali long oris ad lat utll-8 <br> This singular shell which seems to offer the simplest of aU Ce- <br> phalopodous forms and to combine in its septal plates both septum <br> and siphuncle is not unfrequent in the Durness limestone in a <br> silicified state None of the several specimens collected by Mr <br> Peach are perfect <br> The mouth is oval with the longer diameter about 2 inches and <br> the breadth 1 inch in specimens which would measure above 4 <br> inches long The general form is gently curved ending in a some- <br> what obtuse point fig 19 near which the tube is annulated rather <br> strongly while in the older portions it is more faintly so <br> The septa at a diameter of l - inch are rather more than one ith <br> of an inch apart and viewed in section fig 21 show only three con- <br> centric sheaths There is clear evidence only of four septa in the <br> longitudinal section fig 20 the remaining lines being due to the <br> crystallized linings of the chambers These septa end in a sharp <br> point downwards the walls meeting at an angle of about 35° or less <br> Comparison is naturally sought for this remarkable genus among <br> the numerous Cephalopods of the same zone In America the Or- <br> thocerata with large lateral siphuncles woodcut fig 7 a abound <br> Fig 7 ” Diagram of some forms of Lower Silurian Orthoceratidce <br> a Cameroceras h Endoceras c Piloceras <br> and in some of these the diameter of the siphuncle is so great in <br> proportion to the size of the shell as almost to realize the form now <br> under consideration Endoceras proteiforme Hall Pal New York <br> vol i pi 48 c and still more E magniventrum pi 53 show not <br> only a great siphuncular space but also a pointed termination of the <br> siphuncle itself fig 7 h which thus appears as an elongated lobe or <br> process of the hinder part of the body hke one of the many lobes of <br> From TTtXos a cap and the usual termination Kepas 36161933 111474 51125 Page 376 Text v 15 http //www biodiversitylibrary org/page/36161933 1859 Geological Society of London NameFound Cameroceras NameConfirmed Cameroceras Conrad 1842 EOLID 4782558 NameBankID 4101785 NameFound E magniventrum NameFound Endoceras NameConfirmed Endoceras Hall 1847 EOLID 4782576 NameBankID 4155995 NameFound Endoceras proteiforme NameConfirmed Endoceras proteiforme Hall NameFound None NameConfirmed None EOLID 2913255 NameFound Piloceras NameConfirmed Piloceras NameBankID 4297539 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 15 1859 Geology Periodicals Smithsonian Libraries bhl page 36161933 dc identifier http //biodiversitylibrary org/page/36161933 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-07 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12981157933 2015-08-26 14 51 31 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1859 Photos uploaded from Flickr by Fæ using a script | ||||
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