File:The Quarterly journal of the Geological Society of London (12894842435).jpg

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Description

1863..
ETHEBIDGE LTASSIC M0LLTJ8CA.
113
the antero-ventral margin. Border angular

costm concentrically
arranged, and coincident with the form or contour of the shell. Ven-
tral margin of each valve strongly denticulate, each having a row of
strongly defined teeth or serrations, those upon the anterior side being
most numerous. The teeth occupying the centre of the margin are
more closely arranged and more deeply set than the lateral ones

the
whole are inclined inwards, giving the periphery or edge of the
shell a bevelled appearance — a marked feature in the shell.
Affinities and Differences. — This remarkable shell somewhat re-
sembles A. subtetragona from the Upper Lias of Luxembourg, in the
" Schiste et Marne de Grand-Cour," but its form is more tumid and
much deeper, the shell is more massive, and the lines of growth are
not so well defined; and no mention is made in the description of
that shell of the characteristic and specific character of the dentated
Figs. 3-7. — Fossil Shells from the Lias near Belfast.
Fig. 3. Fig. 4.
Figs. 3 & 4. — Ceromya gibbosa. Natural size.
Figs. 5 to 7. — Astarte dentilabrum. Natural size.
edges of the margin of the two valves. It differs from A. ovata of
the Kimmeridge Clay in its more obtuse umbo and more angular
lunular ridges; and although A. ovata is strongly dentated along
the margin, still the dentations are bead-like in the Kimmeridge
Clay species, and columnar and massive in A. dentilabrum from the
Lower Lias

both are equally massive in shell-structure.
Dimensions. — Length \^ inch, height T 8 ^- inch, depth y^ inch.
vol. xx. — PART I.

I
Date
Source https://www.flickr.com/photos/biodivlibrary/12894842435
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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36089354
Item ID
InfoField
111261 (Find related Wikimedia Commons images)
Title ID
InfoField
51125
Page numbers
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Page 113
Names
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NameFound:Astarte ovata NameConfirmed:Astarte ovata NameFound:Ceromya gibbosa NameConfirmed:Oroya gibbosa F. Ritter EOLID:5194168
BHL Page URL
InfoField
https://www.biodiversitylibrary.org/page/36089354
Page type
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Text
Flickr sets
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  • The Quarterly journal of the Geological Society of London. v. 20 (1864).
Flickr tags
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Flickr posted date
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3 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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