Shells of the Holderness Basement Clays. 



97 



Cardium edtile L. (very doubtful ; 



perhaps from Speeton). 

 C. islandicum L. 

 C. (Serripes) grcenlandicum Ch. 

 Corbula gibba Olivi. 



C. pusilla* Phil, vide Jeffr. 

 Crenella decussata Mont. 

 Cyprina islandica L. 

 Donaxvittatus Da Costa (purchased) 

 Dosinia exoleta L. (S. Sea landing). 



D. lincta Pult. (Headley Coll.). 

 Lima excavata Fabr. (York Mus.) 

 Lutraria elliptica Lam. (Filey). 

 Mactra elliptica Brown. 



M. solida L. 



M. suotruncata. 



Modiola ( Volsella), modiolus L. 



Mont acuta dawsoni Jeff. 



M. bidentata.\ 



Mya arenaria L. 



M. truncata L. 



M. truncata uddevallensis E. F. 



Mytilus edulis L. 



Nucula nucleus L. 



A 7 , tenuis Mont. 



N. tenuis in flat a. 



Nucula'{Acila) cobboldies Sow. Note 



D. 

 A. insignis Gould. 

 Nuculana caudata buccata Steem. 



Nuculana pernula Mull. 

 N. minuta Mull. 

 Ostrea celtica A. Bell. Note E. 

 Panomya norvegica Spengl. 

 Pecten islandicus Mull. 

 P. maxim us L. 

 P. opercularis L. 

 P. pusio Penn. 

 P. septem-radiatus Mull. 

 Pectunculus glycimeris L. 

 Pholas crispata L. 

 Saxicava arctica L. 

 S. vugosa L. (salcosa Smith). 

 Solen ensis L. 



Tellina (Macoma) balthica L. 

 T. calcarea Chem. 

 T. obliqua Sow. 

 T. pusilla Phil. 

 Thracia pubescens\ Pult. 

 T. pratenuis Pult. 

 Femjs fluctuosa Gould. 

 V. ovata Penn. 

 Yoldia intermedia M. Sars. 

 Y. lenticula Moll. 

 Y. limatula Say (Jeff.). 

 Y. tenuis Phil. 



y. oblongoides Wood, vide S. P. 

 Woodward. 

 ( Yoldia truncata and Y. oblong- 



oides are perhaps allied species). 



Note A. — Buccinum inexhaustum : — Dr. S. P. Woodward, 

 writing in 1865, could not refer the Bridlington Buccina to 

 any of the ordinary recent forms of B. undatum. Mr. Headley 

 has a large example in the clay matrix, but like so many of the 

 Bridlington shells of other species, while retaining its form, is 

 separated into many fragments. 



It comes near to B. inexhaustum, with which I propose to 

 identify it. 



Note B. — Siftho curtus : — Which American shell Jeffreys 

 had in view when creating this species it is impossible to say. 

 He defines it as having a short spire, and as being smaller, and 

 more tumid than the Fusus gracilis of the earlier Pliocene 

 Crag as then understood, and a little later, when collating 



* Jeffreys seems to have duplicated Phillips's reference in error. 

 Erycina [Tellina) pusilla is the only one named in that author's book 

 En. Moll. Sil. 



f Inserted in the list of Bridlington Shells, by a mistake of Forbes 

 vide S. P. Woodward, Geol. Mag., Vol. I., p. 42. 



{ T. pubescens, recorded from Bridlington and Dimlington. These 

 are very unusual localities for such a very S. W. English Channel species. 

 T. convexa, another large species, occurs fossil at Portobello and Belfast ; 

 also in an elevated glacial deposit 400-500 (?) Drontheim. Sars figures 

 other large Northern Arctic Thracias — T. truncata Brown, and a variety 

 devexa, and I suggest it is to one of these the shell should be referred. 



1917 Mar. 1. 



