File:The Quarterly journal of the Geological Society of London (13365803384).jpg

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1850..
MORRIS AND LYCETT ON PACHYRISMA.
401
valve being received into a small depression aboise the corresponding
process of the right valve^, the tooth of the right valve resting within
the muscular depression of the opposite one. The thickness of this
portion of the test is such, that in an individual which measured six
inches across, it was upwards of three-quarters of an inch.
This shell has some affinities with Isocardia, Opis, and Megalodon ;
the latter of which it appears to represent in the Jurassic period, and
might with it constitute a family, ^' Megalonidce.'" It is distinguished
from Megalodon by the cardinal tooth in the right valve not having
been divided as in the latter genus. Megalodon has the anterior
muscular impression inserted on a somewhat raised or lamelliform
plate ; but it has however a slightly raised plate for the posterior
muscle, or rather the latter may be said to be bordered interiorly by
an obtuse angulated ridge. From Opis it is sufficiently distinguished
by the character of the dentition. The dichotomous ligament re-
sembles that of Isocardia, and when viewed anteriorly it reminds us
of the recent Isocardia cor with its large and graceful diverging um-
bones. Pachyrisma, then, may be described as a Megalodon-like
shell, the dental characters of which, however, are peculiar, com-
bined with the external figure oi Isocardia and Opis.
Example. Pachyrisma grande.
Testa cordata, elongata ; carina obtusa, dorsali, postica, latere antico brevi ; latere

postico profunde depresso ; striis numerosis, concentricis, irregularibus.
Date
Source https://www.flickr.com/photos/biodivlibrary/13365803384
Author Geological Society of London
Full title
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The Quarterly journal of the Geological Society of London.
Page ID
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36934270
Item ID
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113689 (Find related Wikimedia Commons images)
Title ID
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51125
Page numbers
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Page 401
Names
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NameFound:Isocardia NameConfirmed:Isocardia EOLID:4759043 NameBankID:4207414 NameFound:Megalodon NameConfirmed:Megalodon EOLID:9107370 NameBankID:4234705 NameFound:Pachyrisma NameConfirmed:Pachyrisma NameBankID:4275144
BHL Page URL
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https://www.biodiversitylibrary.org/page/36934270
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Text
Flickr sets
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  • The Quarterly journal of the Geological Society of London. v. 6 (1850).
Flickr tags
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Flickr posted date
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23 March 2014
Credit
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This file comes from the Biodiversity Heritage Library.

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.

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26 August 2015

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current10:41, 26 August 2015Thumbnail for version as of 10:41, 26 August 20151,239 × 2,073 (597 KB)Fæ (talk | contribs)== {{int:filedesc}} == {{BHL | title = The Quarterly journal of the Geological Society of London. | source = http://www.flickr.com/photos/biodivlibrary/13365803384 | description = 1850.. <br> MORRIS AND LYCETT ON PACHYRISMA. <br> 401 <br> valve being r...

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