230 A. E. Verrlll — MoUusca of the N'ew England CooM. 



lamellae in crossing the lower posterior ridge become a little more 

 prominent, or form small crests, but fade out at the upper ridge. In 

 one specimen, which does not differ in other respects, the sculpture is 

 much more feeble, consisting of very numerous fine and close con- 

 centric lines, which are but little elevated, but some of these, at vari- 

 able distances apart, are a little stronger than the rest ; the posterior 

 ridges are also nearly obsolete. The epidermis is thin, closely adhe- 

 rent, light yellowish green. The interior surface is bluish white and 

 lustrous, tlie concentric ribs showing through by translucency. The 

 teeth are prominent, sharp, rather slender, strongly compressed, and 

 connected by a tliin, well marked ridge along the inner edge. The 

 anterior hinge-margin is gently curved, and bears, in the larger spe- 

 cimens, about twelve well-formed teeth, besides four or five minute 

 ones close to the cartilage. Just in front of the small triangular 

 cartilage-pit, a small, somewhat prominent, obtuse tooth is developed 

 on the inner surface of the hinge-margin. The posterior hinge- 

 margin is decidedly longer than the anterior, nearly straight, and 

 bears about fifteen distinct teeth, besides a few minute ones close to 

 the cartilage-pit. A distinct ridge runs from the beak to the lower 

 angle of the posterior tip. 



Length of the largest example, 15'"™; height, from ventral margin 

 to beak, 7""" ; from beak to anterior margin, 6""" ; from beak to pos- 

 terior end, TO""". 



Station 2110, ofl" Cape Hatteras, in 51G fathoms (No. 35,729). 



This species somewhat resembles, in size and form, L. tenuisulcata 

 and L. miniita, but it is a thinner, more compressed, and more deli- 

 cate shell, and is quite distinct in its scul])ture and in the structure 

 of the hinge. 



Phaseolus ovatus? (Jeff, mss.) 



Seguenza, Nuculidi terz. mer. Italia, R. Accad. Lincei, Ser. Ill, vul. i, p. 1182, pi. 

 V, fig. 29-29C, 1877. 



Station 2084, in 1290 fathoms, six living specimens. 



Our specimens are small and shaped nearly like Yoldia Jeffreysii, 

 with a smooth, lustrous, iridescent surface and yellowish green 

 epidermis. The hinge-margin is thin, with a few very oblique and 

 appressed, low, feeble teeth, three or four in front and four or five 

 behind the small cartilage-j^it. Its identification is doubtful. 



