102 PALEONTOLOGY OF KEW JERSEY. 



NUCULID^. 



Genus I^UOULA Lam. 



Nucula percrassa. 



Plate Xr, Figs. 4-6. 



Nucula percrassa Conrad. Jour. A. X. S., new ser., Vol. Ill, p. 327, PI. XXXV, Fig. 4. 

 Gabb, Synop., p. 149. Meek, Check-list, p. 8. Geol. Surv. K J., 1868, p. 725. 

 N. percrassa Gabb. Proc. A. K Sci., Phil., 1876, p. 318. 



A single cast of this species occurs in the collections of the A. N. S., 

 Phil., sent to me in a tray with two specimens of Cibota uniopsis Con., from 

 New Jersey, and probably from near Burlington, but without distinctive 

 mark, either as to species or locality. The lithological features of it are 

 quite different from those of the Cibota in the tray, and I presume it to be 

 from Haddonfield or in that vicinity. 'The species has been recognized by 

 several authors as coming from New Jersey, and consequently I have 

 figured this specimen as presumably from within the State. 



The cast is more elongate than any of those of N, Slackiana Gabb, the 

 nearest allied form, and the shell has been more thickened. The cast is 

 about as long again as high, with very large projecting beaks, which are 

 situated at about the anterior third of the .length. The muscular scars are 

 very strong, and the paUial Hue very well marked. The teeth, as indicated 

 on the cast, have been quite numerous, and extend on the posterior side to 

 the muscular scars, but are obliterated on the anterior side. The ligament 

 pit is well marked, but not pix)minent. No markings of the exterior are 

 preserved, the shell having been too thick to transmit them. 



The shell has been proportionally more elongate than N. Slackiana, 

 while nearly of the same height, and the beaks, I should judge, were farther 

 removed from the anterior end. I think the species quite distinct from that 

 one, and well worthy of being retained as valid. 



Nucula Monmouthensis, n. sp. 

 Plate XI, Fig. 1. 



Shell rather below a medium size, triangularly ovate, with convex 

 valves and sharp, pointed beaks, which are even with the anterior end of 



