A EOCENE MOLLUSCA. 
Length, sths of an inch; height, Zths of an inch. 
Localities. Britain: Peckham and Sundridge Park. 
France: Damery, Auvers, &c. 
A few specimens have been sent to me by Mr. C. Meyer with the name of Cyrena 
intermedia, Morris. ‘They are much more rounded than any of that species in my 
possession, and appear to correspond with M. Deshayes’ figures and descriptions of crassa, 
to which I have accordingly referred them with a mark of doubt. M. Deshayes gives 
his species as from the Upper beds. 
This possibly may be the shell that has been called Cyrena obovata? Sowerby, in 
Mr. Whitaker’s List (‘Mem.,’ p. 577) from Dulwich, of the Woolwich and Reading 
series. Possibly, also, the shell figured by Jas. Sowerby, ‘Min. Conch.,’ Tab. 162, 
fig. 4, as from New Cross, may be the same as the above. 
2. Cyruna corpata, Morris. ‘Tab. A, fig. 2 a—e. 
Cyrpna corpata, Morris. Geol. Journ., vol. x, p. 158, t. xi, figs. 7—9, 1854. 
Spec. Char. “C. Testa subtrigonali, crassa, gibbosd, rugosa ; umbonibus prominen- 
tibus ; antico rotundato, postico subrostrato, depresso, attenuato.” (Morris.) 
Length, 13 an inch; height, 12ths of an inch. 
Localities. Dulwich, New Cross, Charlton. (J/eyer.) 
Numerous specimens of this species have been found, and several in a good state of 
preservation have been obligingly sent to me for examination by Mr. C. J. Meyer, some 
from Dulwich and others from Sundridge Park. In general they maintain a great 
uniformity of character, being tumid in the pedal region, but compressed on the other 
side, with a slightly angular slope on the posterior margin, and a projection at the exit of 
the siphons. ‘This shell is covered generally with concentric ridges or prominent lines of 
growth, but Iam unable to say whether these are regularly thickened striae, or whether 
they are the result of irregular decortication, as some specimens are smooth or nearly so. 
Many of these specimens have from three or four to a dozen rays proceeding from the 
umbo to the ventral margin, and these rays appear to have been formed from the loss of 
surface. Probably they were in the living state strongly coloured like some of the 
Veneride, ov like the freshwater shell Galatea radiata, and that the coloured matter 
caused the unequal decomposition of the surface where they existed. ‘This is not very 
unlike another weil-known shell in respect to these rays, viz. Gnathodon cuneatus, which 
inhabits brackish water near Mobile, in the Gulf of Mexico, where it is profusely 
abundant in association with Cyrena Carolinensis. 
Our shell is usually uniform in outline, but all that I have seen have the siphonal 
side more or less compressed, with a prominent and slightly angular termination. 
