26 PALEONTOLOGY OF NEW JERSEY. 



Genus COEBICULA Megerle. 



Corbicula ? emacerata, n. sp. 



Plate II, Figs. 5 and 6. 



Shell of rather small size, transversely elliptical 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 stronglj^ curved and the posterior end narrow and obliquely 

 truncate, the cardinal |)ortion rapidly sloping with a slight curvature to the 

 extremity of the moderately sized ligament; hinge line short and oblique 

 to the axis of the shell. Umbonal angle distinct but not marked, and the 

 cardinal slope narrow and rather abrupt. Surface marked only bj^ fine con- 

 centric striae, which appear to have been confined principally to the epi- 

 dermal layer. 



The shell is of an unusal form for a Corhicula, and may possibly not 

 belong to the genus; but as none of the hinge features are obtainable, it is 

 im])ossible to determine its generic relations satisfactorily. The surfiice 

 has been covered with a jn-etty strong epidermis, and over a large part of 

 the specimen this is the only portion of the onginal substance preserved; 

 the calcareous portion having been mostly removed by solution. 



Formation and locuhty. — From the clays below the lowest Cretaceous 

 sands; clay banks near Woodbridge, New Jersey. 



Corbicula auuosa. 



Plate II, Figs. 2-4. 



Artarfe annosa Conrad. Am. Jour. Concli., Vol. IV, p. 279, PI. XX, Fig. 5 (by error ou 

 description of plate, Fig. 4; see Vol. V, p. 227). 



This species Mr. Conrad describes at the same time with A. veta, in the 

 following language: " Suborbicular, convex, very inequilateral, ventral and 

 anterior margins regularly and nearly equally rounded; posterior end trun- 

 cated, direct (cast.)." 



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 

 ihe substance of the original shell, other than the epidermis, which has been 



