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III.—Some Pelecypod Shell-fragments described as Cirripedes

Published online by Cambridge University Press:  01 May 2009

Thomas H. Withers
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Extract

Among a number of Cirripede plates from the Chalk Marl and Cambridge Greensand of Cambridge submitted to me some time ago, were certain fossils which at first puzzled me considerably. Although there were more than twenty examples, all came apparently from the same side of the animal, that is, they were not left and right, and this led me to suspect that they were not Cirripede valves, and to examine them more closely. One edge close to the narrow end of the shell was then seen to be broken quite clean and straight, and on comparing these fossils with some Pelecypod shells from the same horizon it was quite clear that they were the anterior ears of right valves of Aucellina gryphœides (Sow.) (Text-fig. 7, p. 170), a shell belonging to the family Pteriidae (see H. Woods, Pal. Soc. Monogr. Cretaceous Mollusca, 1905, vol. ii, p. 72, pi. x, figs. 6–13). Other specimens submitted at various times from Jurassic and Cretaceous rocks, turned out on examination to be the anterior ears of the right valves of Pelecypod shells like Pecten, and a number of such specimens were included among some Cirripede plates from the Chalk of liugen obtained for the British Museum by Frau Agnes Laur.

Type
Original Articles
Information
Geological Magazine , Volume 5 , Issue 4 , April 1918 , pp. 168 - 173
Copyright
Copyright © Cambridge University Press 1918

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References

page 171 note 1 The name Pollicipes liasinus was given by Dunker (1848, Palæontographica, Bd. i, p. 180, pl. xxv, fig. 14) to a supposed tergum from the Lias of Halberstadt, and although the figure is not at all like that of a tergum of a Cirripede, an examination of the specimen would be necessary before one could give an opinion as to its nature.

page 172 note 1 In his other memoir (1851, Ray Soc. Monogr. Lepadidæ, p. 245) Darwin thought that he was wrong in considering this to be a carinal-latus, and that it was probably an upper latus.