564 CRETACEOUS PALEONTOLOGY. 



1870. Astarte annosa Con., Am. Jour. Conch., vol. 5, p. 227. 

 1886. Corbicula annosa Whitf., Pal. N. ]., vol. i (Monog. U. S, 

 G. S., vol. 9), p. 26, pi. 2, fig-s. 2-4. 



Description. "Suborbicular, convex, very inequilateral, ven- 

 tral and anterior margins regularly and nearly equally rounded; 

 posterior end truncated, direct (cast.)." (Conrad). 



"I have before me two specimens which I have referred to this 

 species. They are both somewhat distorted by compression and 

 retain but little of the substance of the original shell, other than 

 the epidermis, which has been very strong, and a ferruginous 

 replacement of the ligament. The specimens are both very ven- 

 tricose, with a somewhat subquadrangular outline and a moder- 

 ately angular umbonal ridge. The beaks are small and nearly 

 anterior, hinge line short and oblique, with a small ligament. 

 Anterior end short and rounded, while the posterior is broadly 

 truncated, corresponding to the rather broad and abrupt postero- 

 cadinal slope. If I have rightly identified the species, there can 

 be no reason for referring it to Artarte in the light afforded by the 

 two specimens, but every appearance would indicate their rela- 

 tions to the genus Corbicula, with which I have placed it." 

 (Whitfield.) 



Formation and locality. Raritan clay, Sayreville and Wood- 

 bridge (Whitfield). 



Geographic distribution. New Jersey. 



Corbicula ? emacerata Whitfield. 

 Plate LXIL, Figs. 4-5. 



1886. Corbicula ? emacerata Whitf., Pal. N. J., vol. I (Monog, 

 U. S. G. S., vol. 9), p. 26, pi. 2, figs. 5-6. 



Description. "Shell of rather small size, transversely ellip- 

 tical or subovate in outline, and moderately ventricose. Beaks 

 moderately large but not prominently so, and situated at about 

 the anterior fourth of the length of the shell. Anterior end of 

 the shell the highest, the anterior margin narrowly rounded; 

 basal line strongly curved and the posterior end narrow and 



