LAMELLIBEANCHIATA FEOM BASE OF UPPER MARLS. 215 



means positive that it is a Criocardium except from its general form, as there 

 are no remains of surface markings, either radiating or concentric, visible 

 on any of the casts examined. There are, however, almost positive indica- 

 tions of crenulations around the margin, on the posterior and postero-basal 

 portions, which would indicate the existence of radii on the shell. For this 

 reason, principally, I have placed it under this genus. Criocardium speciosa 

 M. and H., from the Upper Missouri and far western regions, is, perhaps, the 

 nearest allied form, but this one is rather more rotund, a little broader lat- 

 erally, and the angularity of the umbonal ridge will at once distinguish it. 

 This latter feature would have induced me to place the species under the 

 genus Protocardia were it not for the evidence of crenulations on the basal 

 margins of the casts. 



Formation and locality, — All the specimens which I have seen are from 

 the lower layers of the Upper Marls, at -the Buckelew and Corliss pits, at 

 Farmingdale, New Jersey, and are in the collection of Dr. L. Johnson, of 

 New York City. 



CYPRINIDiE 



Genus YENIELLA Stoliczka. 



VenieUa rhomboidea-. 



Plate XXVIII, Figs. 12 and 13. 



Yenilia rhomboidea Conrad. J. A. IS^. Sci., new ser., Yol. II, p. 275, PI. XXIY, Fig. 7. 

 Gabb, Synopsis, p. 178. Meek, Check-list, p. 13. 



Shell rather small, transversely rhomboidal or transversely quadran- 

 gular, dorsal and basal margins subparallel, and the posterior extremity 

 obliquely truncate, longest at the postero-basal angle, anterior end rounded. 

 Valves very ventricose, extremely inflated at the anterior and umbonal re- 

 gion; beaks very large and inflated, strongly enrolled, and reaching almost 

 to the line of the anterior border. Posterior cardinal slope very abrupt, 

 the hinge-line imbedded in a broad depressed escutcheon. Umbonal ridge 

 sharply angular. Surface of the casts marked by a few concentric ridges 

 of growth. 



This species is represented by two very perfect internal casts, very neat 

 and clean in outline and character, but not preserving any remains of the 



