172 MOLLUSCA FROM THE CRAG. 
A small shell from the Paris basin, figured by M. Deshayes, ‘Coq. Foss. des Env. 
de Paris,’ tom. i, pl. vi, figs. 22—25, much resembles ours, and I applied to that 
gentleman for permission to inspect one of his duplicates, and he most obligingly sent 
over to me, for comparison, the only two specimens he possesses, and for which I beg 
to express my obligation. I fully concur with him in opinion that his fossil is speci- 
fically distinct from the Crag shell: although it would have been desirable to have seen 
a larger series of the Eocene shell, there is still so much difference between the two, 
that unless a :auch greater amount of variation exists in the older Tertiary species 
than is generally observable, they may very fairly be kept specifically distinct. The 
Crag shell is much thicker, with a different arrangement of the dental furniture, and 
there are no well-marked lateral teeth in the French shell; and although the artist of 
the figure above referred to has given an angular and pointed outline to the base of 
his shell, with a row of crenulations at the margin, I could not observe either of those 
characters in the specimens submitted to my examination, nor are they so specially 
mentioned in the text; it is possible, however, they may be immature specimens, and 
would consequently have the margins smooth.* 
ASTARTE,| J. Sowerby. 1816. 
VENUS (spec.) Linn. 
Puron®a and PERONEODERMA (spec.) Poli. 
TELLINA (spec.) Poli. 
Macrra (spec.) Mont. 
Cyprina (spec.) Turt. 
TripontTa. Schum., 1817. 
Crassina. Lam., 1818. 
Cypricarpia (sp.) Id. 
Nicanta. Leach, 1819. 
Goopatita. Turt., 1822. 
Macrrorpba. 
; Brown, 1827. 
Macrrina. 
OREADA, 
Puscuta. Roullier, 1846. 
* Since the above had gone to press Sir Charles Lyell has returned from America, whence he had 
kindly undertaken to procure for me, if possible, a specimen of the Transatlantic species for examination, 
and in a letter received by him from Mr. Conrad the following observation occurs, which I have the per- 
mission of Sir Charles to publish. 
“I have examined the shell sent by Mr. Wood, and have compared it with the only specimen we have 
of Erycinella ovalis. It is a smaller shell than the latter, of a more ovate form, and proportionally 
narrower, still, I believe, they constitute one species. Our specimen has radiating lines, as seen through a 
magnifier, but this may be owing to a weathered surface. I have seen a recent shell from the Gulf of 
Mexico, which I think is a congener with these fossils, but I have now none to refer to.” 
+ Etym., the Syrian name of Venus. 
