A. M Verrlll — Mollusca of the Nev) England Coast. 229 

 Yoldia subequilatera (Jeffreys.) 



Leda subequilatera Jeffreys, Proc. Zool. Soc. London, for 1879, p. 579, pi. 46, fig. 3. 



Station 2037, in 1731 fatlioms, eight living specimens (No. 35,201) ; 

 station 20 7S, in 499 fathoms, twenty-five living specimens (No. 

 35,1 38) ; and station 2 1 15, off Cape Hatleras, in 843 fathoms, one dead 

 specimen (No. 38,191). 



It has been taken by the Lightning, Porcnpine, and Norwegian 

 Expeditions, in 459 to 778 fathoms, and off" tlie Azores, in 1622 fath- 

 oms, by the Talisman Expedition. 



Yoldia Jeffreysii (Hidalgo.) 



Leda lata Jeffreys, Ann. Mag. Nat. Hist., Nov. 187G, p. 431. 



Leda Jeffreysi Je&rejs, Proc. Zool. Soc. London, for 1879, p. o79, pi. 4G, 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 Verriii, 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 

 ti]), 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- 

 la;, which are separated by concave intervals of variable width, those 

 towards the umbos being narrower than those near the margin. The 



