102 SUPPLEMENT TO THE CRAG MOLLUSCA. 
Bell ( Ann. and Mag. Nat. Hist.,’ 1870) give O. cochlear as a Cor. Crag fossil, the former. 
referring my var. spectrum to that species. 
This probably may be so. I have therefore inserted it here as a species. 
OstREA PLICATULA, Gme/. Supplement, Tab. VIII, fig 10. 
Locality. Cor. Crag, Sutton. 
I have represented a specimen of the genus Osfrea obtained by myself which varies 
_ considerably from the normal condition of O. edulis, but it is difficult to determine the 
limitation of a species in this variable genus ; however, if O. cochlear be entitled to that 
distinction, I think my present shell may have the same honour. It may possibly be O. 
ungulata, Nyst., but I have given to it the prior name by Gmelin. ‘This is very variable, 
adhering sometimes by a very small part of the shell near the umbo, but I have specimens 
with similar rays in which the attachment of the lower valve had been effected by much 
the larger part of the surface. It resembles, and is probably the same as O. cristata, 
Born (tab. 7, fig. 3), which is plicated only near the margin. 
OstREA FLABELLULA, Lamarck. 
Locality. Red Crag, Sutton P 
Many years ago I noticed in the late Mr. Edward Acton’s collection of shells from the 
nodule workings in the Red Crag near Woodbridge a specimen of this species; but I 
have been unable since his death to find where it has gone to, or I would have had it 
figured. It was mentioned in my paper on the extraneous fossils of the Red Crag (‘ Quart. 
Journ. Geol. Soc.,’ vol. xv, p. 32), as probably introduced into the Red Crag from an 
older formation. I perceive that it is given as a species from Biot, which is classed 
among the Upper Tertiaries, so it is not clear but that 1t may have lived in the Cor. Crag 
sea. The lithological condition of the Red Crag specimen was, however, like that of 
Rostellaria lucida and. others, regarded as derivative from older Tertiaries. 
Hunnires Corresyt, De France. Crag Moll., vol. 1, p. 19, Tab. IIT. 
Localities. Cor. Crag, Ramsholt. Red Crag, Sutton, Trimley (Bel/). Fluvio- 
marine Crag, Thorpe ? 
In the «Ann. and Mag. Nat. Hist.,’ September, 1870, this shell is given by Mr. 
Bell from the Red Crag of Trimley as Hinnites giganteus, and in the list to Mr. Prestwich’s 
Cor. Crag paper (‘ Quart. Journ. Geol. Soc.,’ vol. xxvii, p. 139), this name is also n- 
serted for the Crag shell by Mr. Jeffreys, and it is given in the list by Dr. P. Carpenter 
