OSTREA acuminata. 
TAB. C XXXV. —Fig. 2 and 3. 
Spec. Char. Depressed, very long, curved, with 
large subimbricated transverse waves beneath : 
beaks and front acuminated. 
Two or three times as long as wide, the upper valve 
rather concave, smooth and nearly even, with a beak 
almost equal to that of the other valve. 
Fig. 2. represents specimens sent me from the clay 
under the great Oolite of Bath, by favour of the Rev. H. 
Steinhauer in 1813 : they have been parasitical on va- 
rious formed things : have little or no auricles ; they 
have large undulations, and vary much as to curvature. 
Fig. 3 . are taken from shells found at Aynho, North- 
amptonshire, by Miss Wilson. They appear to be the 
same species as the last mentioned, and they vary very 
much as to their length, curvature, &e. : yet the undu- 
lations may help to distinguish them. I have similar 
shells from near Withy am, Sussex. 
