107 



more inflated, its outlines more curved and oblong, and its 

 beak more prominent. 



5. Cyprina sp. 



Besides the above mentioned species of the genus Cyprina 

 there has been found still another species at Кар Dalton, 

 which differs very much from the former, but on account of 

 its bad state of preservation it does not allow of exact deter- 

 mination. The only specimen we have consists of the remains 

 of two united valves in their natural position. The shell is 

 oblique and oblong, rather strongly inflated, the umbo is rather 

 short and thick. The lunule is absent. 



This specimen was found in the Coeloma-bed. 



6. Astarte cfr. tenera Morris. 



Plate III, figs. 5 a— b. 



1852. Astarte tenera Morris, Fossil shells from the Lower Thanet Sands. 



Quart. Journ. Geol. Soc. vol. VIII; p. 265, pi. 16, fig. 6. 

 1871. Astarte tenera Morris; S. Wood, Eocene Bivalves. I. p. 157, pi. 

 24, fig. 14. 



One fragment of a shell has a close resemblance to 

 Ästarte tenera, as described and drawn by Morris from Thanet 

 Sands at Herne Bay. But even for a moderately certain deter- 

 mination the material is too insufficient. 



The Cyrena-bed: 1 specimen. 



Occurrence. England: Eocene of Herne Bay (Morris, 

 Wood). 



7. Cyrena Graresi Deshates. 



Plate 111, figs. 6—9. 



1824. Cyrena Gravii Deshates, Coquilles fos. des envir. de Paris. I. 



p. 120, pi. 19, fig. 3—4. 

 1860. Cyrena Gravesi Deshayes, Animaux sans vertèbres. I. p. 498. 



The most frequent fossil in the material brought home is 

 a Cyrena, which agrees well with C. Gravesi Desh. On account 



