﻿376 DESCRIPTIONS OF NEW SPECIES OF 



MERCENARIA, Schum. 



M. cancellata. PL 67, fig. 25. Convex, beaks inclined anteriorly ; umbones 

 prominent and rounded; cardinal margin slightly curved, anterior extremity and 

 basal margin rounded, posterior extremity subangular at its junction, both with the 

 basal and cardinal margin ; surface marked by numerous small angular ribs crossed 

 by fine, radiating, impressed lines ; anterior muscular impression semi-lunar, posterior 

 larger and irregular ; pallial sinus small and angular. 



Dimensions. — Length If in., width 2f in., depth of valve - 7 in. 



Locality and position. — With the above. 



Collection of the Academy. One valve. 



OSTREA, Linn. 



0. mauricensis. PL 67, fig. 26. Elongate, subquadrate, narrower at the dorsal 

 than at the ventral or basal end, widest just below the muscular scar, slightly 

 squamose on the surface ; muscular scar placed nearly midway between the hinge 

 and basal margin, somewhat crescentic, but widest at its internal end ; ligament area 

 wide and undulating. 



Dimensions. — Length lh inches, greatest width li inches. 



Locality and position. — Miocene marl, Maurice River, N. J. 



My collection. 



I have seen but two lower valves of this species. It was presented to me by my 

 friend Mr. C. C. Abbott. 



EOCENE SPECIES. 



The following species are all from Texas. Many of them were sent by Mr. Kellogg, 

 from Wheelock, Texas, to the Smithsonian Institution and to the Academy ; the rest 

 were given me by my friend Dr. Francis Moore, and are from Caldwell Co., Texas. 

 They are all from a deposit apparently synchronous with that at Claiborne, Ala. ; one- 

 third of the species found in the Texan beds, being identical, specifically, with those 

 found in Alabama. 



SEPIA, Arist. Molina 1782. 



y'S. (Belosepia) ungula. PI. 67, figs. 1, 2, 3, 4. 



S. (Belosepia) ungula, Gabb. Proc. Acad. 1860, p. 324. 



Shell laterally compressed, especially posteriorly ; beak robust, acute, arcuate, and 

 with a very faint ridge on the dorsal surface ; ventral plate smaller in proportion than 

 in the other species of this subgenus, slightly undulate and radiate, edge smooth and 

 sharp ; dorsal callus straight, deeply rugose, marked on the edge, by about three 

 irregular rugae and covered on the face and sides with pits or cavities, which extend 



