844 CRETACEOUS PALEONTOLOGY. 



with rather large pits arranged in more or less irregular curved 

 series, the space between the rows, especially over the central 

 portion of the valves, being raised into thin and sometimes 

 coalescing ridges." (Ulrich). 



Formation and locality. Vincentown limesand, Vincentown 



(154). 



Geographic distribution. New Jersey; also 1 Eocene of Mary- 

 land. 



Family OYPBIDAE. 



Genus BYTHOCYPRIS Brady. 



Bythocypris parilis Ulrich. 

 Plate CX., Figs. 4-7. 



1901. Bythocypris parties Ulr., Md. Geol. Surv., Eocene, p. 

 117, pi. 1 6, figs. 5-8. 



Description. "Carapace about i.o mm. long and nearly or 

 quite 0.5 mm. high; reniform, strongly arched dorsally, very 

 slightly sinuate or straight in the ventral portion of the outline, 

 and with the ends rounded and very nearly equal, the posterior 

 outline, however, being usually a trifle oblique above, and the 

 turn into the basal line slightly lower than at the front end ; point 

 of greatest thickness above the middle, the slope toward the 

 ventral edge being flatter than elsewhere; edge view elongate r 

 subelliptical, the anterior extremity more acute than the posterior, 

 the latter being comparatively blunt. Left valve slightly over- 

 lapping the right both above and below, its ventral edge some- 

 what thickened in the middle and bordered along the anterior 

 and posterior thirds of its extent by a sharply impressed, thin 

 line. Surface generally appearing quite smooth, but under favor- 

 able circumstances very small scattered punctae may be observed. 

 Interior of valves with the marginal plate well developed and 

 widest in front." (Ulrich.) 



Formation and locality. Vincentown limesand, Vincentown 



(154). 



Geographic distribution. New Jersey; also Eocene of Mary- 

 land. 



