8 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 zxtermedia more resembles the 
English fossil, but is larger. 
8. Cyrena? putnastra, S. Wood. ‘Tab. A, fig. 11. 
Length, 1} inch; height, 1 inch. 
Locality. Dulwich. (deyer.) 
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, | 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. Crrena tricona, Deshayes. ab. A, fig. 9 a—e. 
CyRENA TRIGONA, Desh. Coq. Foss. des Env. de Par., t. i, p. 118, pl. xix, figs. 16, 17, 
1824. 
— — Id. An. sans Vert. du Bas. de Par., t. i, p. 513, 1860. 
Spec. Char. “ C. Testa ovato-trigond, minima, crassd, levigatd, cordiformt, obliqua ; 
umbonibus productioribus, recurvis ; dentibus cardinalibus tribus, duobus in alterd (valvd) 
lateralibus serratis.’ (Desh.) 
Length, %ths of an inch. 
Localities. Britam: Dulwich. (JZeyer.) 
France: Lysi, pres Kpernay. 
A very perfect specimen (fig. 9 ¢), 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, 6) 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 
