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EOCENE MOLLUSCA. 



I have left our shell, therefore, as Mr. Prestwich originally referred it, until the 

 French and English specimens can be closely compared. The description given by 

 Melleville of his species agrees better with our shell than does the figure he has given. 

 On the other hand, the figure given by Sandberger of intermedia more resembles the 

 English fossil, but is larger. 



8. Ctrena? pullastra, 8. Wood. Tab. A, fig. 11. 



Length, l\ inch ; height, 1 inch. 

 Locality. Dulwich. {Meyer?) 



The specimen figured is from the cabinet of Mr. Meyer, and it is the only one that 

 I have seen. On the tablet Mr. Meyer had written Cyrena or Unio ? The two valves 

 are so firmly united by the matrix that I am, like Mr. Meyer, doubtful as to what 

 genus it ought to be referred, but as it appears to be not very far removed from Cyrena 

 Dulwichiensis, I have provisionally retained it under the same genus ; and it may possibly 

 even prove to be only a variety of that shell. Its shape so much resembles the genus 

 Tapes or Pullastra that I have thought the latter a suitable specific appellation. 



9. Cyrena trigona, Deshayes. Tab. A, fig. 9 a — c. 



Cyrena trigona, Desk. Coq. Foss. des Env. de Par., t. i, p. 1 18, pi. xix, figs. 16, 17, 

 1S24. 



— — Id. An. sans Vert, du Bas. de Par., t. i, p. 513, 1860. 



Spec. Char. " C. Testa ovato-iriyond, minima, crassd, laevigata, cordiformi, obliqitd ; 

 umbonibus productioribus, recurvis ; dentibus cardinalibus tribus, dtiobus in altera (valvd) 

 later alibus serratisy [Desh.) 



Length, fths of an inch. 



Localities. Britain: Dulwich. (Meyer.) 



France : Lysi, pres Epernay. 



A very perfect specimen (fig. 9 c), with the umbones in apposition, has been sent to 

 me for examination by Mr. Meyer ; and although I have only the figure of the French 

 species for comparison, I think there is no doubt but that the British fossil is identical 

 with it. The valves lie on the clay with only the exterior exposed. Another specimen 

 (fig. 9 a, b) from Sundridge Park I have regarded as belonging to the same species, 

 though it has a more depressed umbo, and wants the subangular ridge on the posterior 



