32 TAL^ONTOLOGY OF NEW JERSEY. 



tion with the above is obHquely oval and destitute of surface markings 

 except concentric Hues of growth. These indicate that for one-half of its 

 size it was nearly circular, and presenting much the appearance of the lower 

 valve of Anomia teUinoides Morton. It is, however, an upper valve of an 

 oyster and of this species. The muscular scar is somewhat larger and a 

 little more central. 



Formation and hcality. — Dr. Morton gives Arneytown, N. J., as the 

 locality for his specimens, which would place them in the Lower Green Marls. 

 The specimens used in the above description and illustrated are from the 

 collection of the Acad. Nat. Sci., Philadelphia, from whence they were 

 boiTOwed for the purpose. 



Ostrea subspatulata. 



Plate III, Fig. 14. 



Ostrea subspaiulata L. & Sow. Quar. Jour. Geol. Soc, 1845, p. 61, Fig. — . Gabb, 

 Syuop., p. 154. Meek, Checklist, p. C. Geol. Surv. N. J., 1868, p. 724. 

 Gabb, P. A. iS. Sci., Phil., 1876, p. 320. 



This species has been cited as coming from New Jersey by both Mr. 

 Gabb and Mr. Meek, though I do not know on what authority. The only 

 specimens which I have seen at all resembling the figures of it given in the 

 article in the Geological Society's Journal are casts of young specimens 

 probably. At least they are very small compared with those there described 

 and figured. On page 64 of the Quarterly Journal, in a list of species 

 peculiar to New Jersey Cretaceous, Sir C. Lyell mentions this species, but 

 his New Jersey doubtless extended all along the Atlantic coast as far as the 

 green-sand formation appeared; for under the description of the species it 

 is cited only as coming from "Lewis's Creek, South Washington, N. C." 



The casts from New Jersey are more or less subovate and a little oblique, 

 slightly concave on the upper side and quite convex on the lower surface; 

 narrowed at the upper end but not sharp; having some width and slightly 

 shouldered. Muscular scars rather large, subovate or subreniform and 

 prominent, situated near the side, and pretty well forward on the valve. 



The remains of the shells of this genus are amongst the most unsatis- 

 factory material obtained from the geological formations of the State. 



