A, EF. Verrili— Mollusca of the New England Coast. 229 
Yoldia subequilatera (Jeffreys.) 
Leda subequilatera Jeffreys, Proc. Zool. Soc. London, for 1879, p. 579, pl. 46, fig. 3. 
Station 2037, in 1731 fathoms, eight living specimens (No. 35,201) ; 
station 2078, in 499 fathoms, twenty-five living specimens (No. 
35,138); and station 2115, off Cape Hatteras, in 843 fathoms, one dead 
specimen (No. 38,191). 
It has been taken by the Lightning, Porcupine, and Norwegian 
Expeditions, in 459 to 778 fathoms, and off the Azores, in 1622 fath- 
oms, by the Talisman Expedition. 
Yoldia Jeffreysii (Hidalgo.) 
Leda lata Jeffreys, Ann. Mag. Nat. Hist., Nov. 1876, p. 431. 
Leda Jeffreysi Jeffreys, Proc. Zool. Soc. London, for 1879, p. 579, pl. 46, fig. 2. 
Station 1093, in 349 fathoms, 1882; and station 2084, in 1290 
fathoms, 1883, several fresh specimens (No. 38,415). 
It has been taken at numerous localities off the coast of Europe, 
and between the Azores and Bermudas, at depths ranging from 452 
to 2199 fathoms. 
Our specimens are not full grown and have the hinge plate light 
~ and thin, with very slender teeth, but in other respects they agree 
well with Mr. Jeffreys’ original specimens, with which I have com- 
pared them at the National Museum. 
Leda Bushiana Verrill, sp. nov. 
Shell narrow-lanceolate in form, compressed, with the front end 
simple and bluntly rounded, much shorter than the posterior end, 
which tapers gradually and ends in a narrow, truncated tip, which is 
not upturned, or but very slightly so. The umbos are a little prom- 
inent and rather sharp. From the apex two rounded ridges run to 
the posterior end; the lower one, running to the lower angle of the 
tip, is pretty strongly marked, and causes a slight undulation of the 
surface and of the margin below it. The posterior dorsal margin is 
compressed, rising in the form of a sharp, smooth keel, which has 
usually a slightly convex outline. The dorsal area is pretty clearly 
separated from the rest of the surface by the upper angular ridge 
running from the beak. In front of the beak there is a small but 
pretty well defined lunule. The surface, in all but one specimen, is 
covered with rather strong, sharply defined, raised concentric lamel- 
lx, which are separated by concave intervals of variable width, those 
towards the umbos being narrower than those near the margin, The 
