NO. 1139. DEEP-WATER MOLLUSC A VEKRILL AND BUSH. 821 



region, it differs in its much smaller size, much less iridescent interior, 

 straighter postero-dorsal margin, less upturned rostrum, and narrow, 

 or more accumulate, posterior halt' of the shell. The hinge also differs 

 in several respects. 



KENNERLIA BREVIS, new species. 



(Plate LXXXVIII, fijys. 7, a, b.) 



Kennerlia glacialis VEKRILL, Notice of Recent Add. to Mar. Invert., Pt. 2, Proc. 

 IT. S. Nat. Mus., Ill, p. 397, 1881; Traus. Couii. Acad., V, p. 567, 1882; VI, 

 p. 277, 1884. BALL, Bull. U. S. Nat. Mus.. No. 37. p. 68, 1889 (in part). 



Shell short, sublimate, very inequilateral, obtuse at both ends, slightly 

 narrowed anteriorly. The autero-dorsal margin is short and slopes 

 rather rapidly to the anterior end, where it forms an obtuse angle with 

 the ventral margin which is broadly and nearly evenly rounded, and 

 passes into the rounded posterior margin without angulation, but some- 

 times witli a slightly sinuous curve below; there is also, sometimes, a 

 very slight sinuosity anteriorly; the postero-dorsal margin is nearly 

 straight. The left valve is rather convex, moderately thick, nearly 

 smooth, with a distinct, narrow radial ridge running from the beak to 

 the posterior end. The right valve is smaller, concave or nearly flat, 

 lunate, widest behind the middle, regularly curved ventrally or faintly 

 sinuate anteriorly; its surface is marked by lines of growth and crossed 

 by radial grooves, of which about ten are very distinct, while many 

 others, much finer, can be seen with a lens. In the right valve the 

 hinge consists of two small, divergent teeth, both of which are directed 

 posteriorly. The rather thin, elongated posterior one, in a profile view, 

 is obtusely triangular, its highest point distal to the middle; the slender 

 resilium is attached to this, nearly the whole length of its anterior side, 

 and carries a long, narrow ossicle. The cardinal tooth directly under the 

 beak, is much shorter and somewhat thicker, with its highest point 

 near the proximal end which is close to the dorsal margin. There is 

 also a slightly elevated, rather indistinct, anterior sub marginal ridge, 

 parallel with the margin, which supports a slender ligamental groove. 

 In the left valve the hinge consists of a submarginal, thickened, 

 blunt anterior tooth, running forward subparallel with the margin, and 

 a posterior submarginal thickening or ridge having the resilium attached 

 to its anterior side; the V-shaped space is relatively very wide and is 

 not divided by any distinct intermediate ridges, such as occur in typical 

 Pumlom. The resilium appears to be simple, not divided in a V-shaped 

 form as in the latter genus. 



Length of one of the largest specimens, 11.5 mm.; height, 7 mm.; 

 thickness, 3 mm. 



Found in small numbers at about ten stations between N. lat. 40 15' 

 30", W. long. 70 27', and X. lat, 85 10' 40", W. long. 75 6' 10", in 58 

 to 100 fathoms, 1880-1880. 



This species, which is southern in its range, is closely related to the 



