226 A. E. Verrill— Mollusca of the New England Coast. 
Cryptodon tortuosus (Jeffreys.) 
Axinus tortuosus Jeffreys, Proc. Zool. Soc. London, for 1881, p. 702, pl. 61, fig. 6. 
Station 2078, in 499 fathoms, two specimens; station 2084, in 1290 
fathoms, four living specimens (No. 38,175); and station 2115, off 
Cape Hatteras, in 843 fathoms, two living specimens (No. 35,611). 
Off the European coast, it was taken by the Porcupine Expedi- 
tion, in 1870, and by the Travailleur Expedition, in the Bay of 
Biscay. It occurred in 645 to 1012 fathoms. 
Malletia obtusa (M. Sars) Mérch. 
Yoldia obtusa G. O. Sars, Remarkable Forms of Animal Life, p. 23, pl. 3, figs. 16-20, 
1872. 
Malletia obtusa G. O. Sars, Moll. Reg. Arct. Norvegize, p. 41, pl. 19, figs. 3, a—b. 
Jeffreys, Proc. Zool. Soc. London, for 1879, p. 586. 
This species occurred at stations 2018, 2041, 2042, 2043, 2076, 
2077, 2084, 2095, 2096, 2102, 2105, 2106, 2110, 2115, in 516 to 1608 
fathoms. It was most common at station 2043, N. lat. 39° 49’, W. 
long. 68° 28' 30", in 1467 fathoms, fifteen specimens (No. 38,180) ; 
and at station 2096, N. lat. 39° 22’ 20”, W. long. 70° 52’ 20”, in 1451 
fathoms, forty-five dead specimens (No. 34,782). 
Yoldia hyperborea Torell. 
Torell, Spitzbergens Molluskfauna, p. 149, pl. 2, figs. 6, a—b, 1859. 
Yoldia limatula G. O. Sars, Moll. Reg. Arct. Norvegiz, p. 40, pl. 4, figs. 12, a-b, 
1878 (non Say). 
This species is closely allied to Yoldia limatula and Yoldia myalis, 
but is evidently distinct from both. Hitherto it has not been recog- 
nized as an inhabitant of the American coast, but it is not uncommon 
off the coast of Nova Scotia. 
It was dredged by the U.S. Fish Commission at station 55, in 33 
fathoms; stations 61-63 and 63-67, in 20-41 fathoms, 1877. 
Yoldia sericea Jeffreys, var. striolata J. 
Jeffreys, Mollusca Valorous Expd., Ann, Mag. Nat. Hist., 1876, p. 432; Proc. 
Zool. Soc. London, for 1879, p. 579, pl. 46, fig. 1. 
This species occurred at stations 2035, 2037, 2041, 2042, 2043, 
2052, 2076, 2084, 2096, 2103, 2106, 2110, 2111, 2115, in 516 to 1731 
fathoms. It occurred in greatest abundance at station 2076, N. lat. 
41° 13’, W. long. 66° 00’ 50", in 906 fathoms, one hundred and sixty 
