438 A. E. Verrill — MoUusca of the New England Coast. 

 Kelliella nitida Ven-iii, sp. nov. 



Shell thill, delicate, translucent white, swollen, subcordate in a side 

 view ; in a front view regularly broad-cordate. Umbos swollen ; 

 beaks strongly curved forward; lunular area broad-cordate, running 

 up between the beaks and bounded by a definitely impressed line. 

 The posterior dorsal outline is sloping and slightly convex, forming a 

 slight angle where it joins the broadly rounded ventral margin ; in 

 the middle of the ventral margin there is a slightly marked, broadly 

 rounded angle, from which a faint but perceptible ridge runs up to 

 the umbos. The surface is everywhere covered with fine, close, very 

 regular raised lines, and usually has an iridescent luster. The hinge 

 in the right valve consists of a long, thin, flexuous lamina, separated 

 by a groove from the margin, rising into two somewhat thickened 

 and more elevated lobes opposite the beaks, and with a small, thin, 

 partially detached, tooth-like process farther forward. The two ante- 

 rior lobes, viewed in some directions, appear like two small, thin 

 teeth, separated by a notch, and projecting somewhat downward. In 

 the left valve the lamina is more complicated, just behind the beak 

 it splits into two portions, leaving a groove between ; the anterior 

 portion forms a long, flexuous lobe opposite the beak, the anterior 

 end expanding slightly and rising above the margin like a small 

 curved tooth ; farther forward and separated by a notch, it forms 

 another similar tooth-like lobe. The ligament is light yellow and 

 occupies a short, well-marked groove, behind and under the beak. 



Length of the largest specimens, 5'5'""' ; height, 5"'"' ; thickness, 

 4-5'"™. 



Station 2221, in 1,525 fathoms, about a dozen specimens, alive and 

 dead (No. 40,49«). Station 2038, in 2,0;33 fathoms, one dead speci- 

 men (No. 35,217.) 



This species is closely related to K. miliaris of Europe, but is 

 larger, more angular, and more distinctly and regularly sculptured. 

 The European species has been regarded by JeftVcys as the young of 

 Isocardia coi\ but G. O. Sars and others consider it a distinct form. 

 On the American side no species of 7;sorffrr?^V/ is known, which ren- 

 ders it probable that the present shell is an adult form. 



Nucula trigona Vorriii, sp. nov. 



Shell of moderate size, rather thick and solid, conspicuously triang- 

 ular, with the beaks high, forming an acute angle. The surface is 

 ■smooth and lustrous, marked only with very faint lines of growth. 



