438 A, FE. Verrili—Mollusca of the New England Coast. 
Kelliella nitida Verrill, sp. nov. 
Shell thin, 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, 
eae 
Station 2221, in 1,525 fathoms, about a dozen specimens, alive and 
dead (No. 40,498). Station 2038, in 2,033 fathoms, one dead speci- 
men (No. 35,217.) 
This species is closely related to A. miliaris of Europe, but is 
larger, more angular, and more distinctly and regularly sculptured. 
The European species has been regarded by Jeffreys as the young of 
Tsocardia cor, but G. O. Sars and others consider it a distinct form. 
On the American side no species of Zsocardia is known, which ren- 
ders it probable that the present shell is an adult form. 
Nucula trigona Verrill, 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, 
