372 SMITHSONIAN MISCELLANEOUS COLLECTIONS [vor. 48 
species is considerably heavier and more solid than any of the 
Aurinias, is smaller and more slender than M. junonia and is 
doubtless a perfectly valid species. 
Subfamily VoLUTOMITRINZ& 
Genus VOLUTOMITRA Gray 
Volutomitra Gray, in Adams, Gen. Rec. Moll., 1, p. 172, pl. x1x, fig. 2, 
1853; type Mitra grénlandica Beck; u, p. 619, 1858; Guide Moll. Brit. 
Mus., p. 36, 1857; Dati, Bull. Mus. Comp. Zool., xvi, p. 145, pl. 
XXxIVv, figs. 6-7, 1889. 
Mitra (Beck) Mo6tier, Index Moll. Gronl., p. 15, 1842; Reeve, Conch. 
Icon., Mitra, pl. xv, fig. 106, 1844; Tryon, Man., tv, p. 124, 1882. 
This small boreal group has a single row of unicuspidate rhachi- 
dian teeth with deeply arcuate base, no operculum, no appendices 
to the siphon, the tentacles adjacent, not seated on disks, with the 
eyes one third above the base of the tentacles on prominent tuber- 
cles; the verge is subcylindrical; the shell small, unicolorous, with 
a conspicuous dark periostracum and plaited pillar. The nucleus 
is small and apparently calcareous. 
VOLUTOMITRA GRONLANDICA Beck 
Mitra gronlandica Beck, in Moller, Index Moll. Gronl., p. 15, 1842; REEVE, 
Conch. Icon., Mitra, pl. xv, fig. 106, 1844; Tryon, Man., Iv, p. 124, 
pl. 36, fig. 83, 1882. 
V olutomitra gronlandica H. anp A. ApAms, Gen. Rec. Moll., 1, p. 172, 
pl. xrx, fig. 1, 1853; Gray, Guide, p. 36, 1857; Dat, Bull. Mus. Comp. 
Zool., XVIII, p. 145, pl. xxx1v, figs. 6-7, 1889; Sars, Moll. Reg. Arct. 
Norv., p. 244, pl. 23, fig. 12, 1878. 
Habitat—Greenland coast from Disco Bay southward in from 
15 to 200 fathoms; Wellington Channel (Belcher) ; Iceland; Spits- 
bergen; Finmark, in 80-100 fathoms (Sars). Also in Pleistocene 
of Britain (Stimpson). 
U. S. Nat. Mus., 86,974, 86,975. 
The shell is about an inch in length and has been well figured by 
Sars, whose most southerly locality is a sea-bank off Tromso. It 
is not known from the eastern coast of the United States, but prob- 
ably occurs on the Labrador coast. 
VOLUTOMITRA ALASKANA Dall 
Volutomttra alaskana Dati, Nautilus, xv, p. 103, Jan., 1902. 
Habitat—Southern and eastern parts of Bering Sea and the 
Aleutian Islands, in 60 to 85 fathoms, mud; and southward in the 
Pacific, off the American coast, following the water-isotherms of 
