108 PALAEONTOLOGY OF NEW JEESEY. 



me show the ligamental pit beneath the beak on the hinge-area, in conse- 

 quence of which I am not able to fully determine if it is a true Nticidana, 

 or if it may more properly belong to the genus Yoldia. 



Formation and locality. — In fine micaceous clay at the base of Cretn- 

 ceous at Haddonfield, New Jersey. Mr. Conrad's type specimens were from 

 a similar deposit at Eufaula, Barbour County, Alabama. 



Nuculana pinnaformis. 



Plate XI, Figs. 7 and 8. 



Leda pinnaforma Gabb. J. A. N. S., Phil., 2d ser., Yol. lY, p. 303, PL XLYIII, Fig. 22 



(by error, 23 in text). 

 L, pinnceformis Gabb. Synopsis, p. 133. 

 Nuculana pinnceformis (Gabb). Meek, Check-list, p. 8, and iV\ pinnaformis (Gabb), 



Meek, Geol. Surv. N. J., 1868, p. 725. 



Shell minute, the only example seen being only one-fourth of an inch 

 in length. Form elliptically cuneate, very ventricose, and comparatively 

 broad across the beaks, with the posterior extremity pointed. Beaks large 

 and rather prominent, directed backwards, and situated about two-fifths of 

 the length from the anterior end. Anterior end broadly rounded, a little 

 pointed at the longest part; basal line extremely gibbous. Postero-cardinal 

 margin depressed, forming a narrow, almost linear, depressed area along the 

 margin from the beaks to the posterior extremity. Surface of the shell 

 marked by comparatively strong concentric lirations, which die out at the 

 edge of the depressed area bordering the cardinal line. Interior and hinge 

 features not observed. 



This species is nearly of the size of N, compressifrons Conrad, but is 

 broader in comparison to its length, more pointed at the extremity, has the 

 beaks situated farther from the anterior end, and has the surface strongly 

 lirated, while that one is smooth. The single individual used in the descrip- 

 tion was observed among the specimens of N. compressifrons from the col- 

 lection of the Academy of Natural Sciences of Philadelphia, but without any 

 distinctive mark, and is evidently from the same locality. It is somewhat 

 longer proportionally than the figure given by Mr. Gabb loc. cite., but is 

 doubtless the same species. 



