MUSEUM OF COMPARATIVE ZOOLOGY, 210 
spines at the shoulder, directed decidedly upward, but in others they are scarcely 
perceptible. The entire surface is covered with microscopic revolving striæ, 
more distinct in some specimens than in others, crossing the obscure lines of 
growth. Nucleus large, smooth except for the microscopic striw, shining, con- 
sisting of one and a half turns, with a large, rather prominent apical whorl. 
Length of the largest specimen, which is broken at the tip, 18.5 mm.; breadth, 
8.5 mm.; length of aperture, 11 mm.; its breadth, about 3.5 mm.; length of 
canal, about 6.5 mm. Length of a smaller, perfect specimen, 14.5 mm. ; great- 
est breadth, about 7 mm.; length of aperture, 9 mm.; its breadth, 2.5 mm.; 
length of canal, about 4.5 mm. 
Trophon clavatus Sars, T. abyssorum Verrill and its variety limicola Verrill, 
T, aculeatus Watson, and Boreotrophon (aculeatus Watson, var.?) lacunellus Dall, 
are all related to the present species! A careful study of their descriptions 
and figures, however, reveals marked differences in their size, number of 
whorls, character and number of lamelle, and presence or absence of spiral 
sculpture. T. aculeatus Watson is doubtless most readily distinguished by the 
distinct angulation or keel at the shoulder of the whorls. 
Anachis Haliseti (Jerrreys). 
Anachis costulata Verrill, Trans. Conn. Acad., V. p. 518, pl. 43, fig. 7, 1882. 
Anachis Halicveti Verrill, op. cit., VI. p. 252, 1884. 
Dall, Bulletin U. S. Nat. Mus., No. 97, p. 110, 1889. 
One living specimen, Station 310, south of Martha’s Vineyard, in 260 fath- 
oms. One living, Station 336, off Delaware Bay, in 197 fathoms. 
Jommon in the U. S. F. C. collection from Cashe’s Ledge to off Cape Hat- 
teras, N. C., in 48 to 1,537 fathoms; not living in less than 52 fathoms. 
Astyris diaphana VERRILL. 
VERRILL, Trans. Conn. Acad., V. p. 513, pl. 58, fig. 2, 1882. 
Darr, this Bulletin, XVIII. p. 191, pl. 85, fig. 9, 1889; Bulletin U. S. Nat. Mus., 
No. 87, p. 118, pl. 35, fig. 9, 1889. 
One living specimen, Station 321, off Charleston, 8. ©., in 233 fathoms, 
A comparatively rare species found by the U. S. F. C. from south of Martha’s 
Vineyard to off Cape Hatteras, N. C., in 64 to 487 fathoms ; not living in less 
than 100 fathoms. Mr. Dall records it as far south as the Gulf of Mexico, in 
196 fathoms, dead. 
1 G. O. Sars, Moll. Reg. Arct. Norvegiæ, p. 249, pl. 15, fig. 12; pl. 23, fig. 14; 
pl. 9, fig. 17, 1878, Verrill, Trans. Conn. Acad., VI. p. 421, 1885. Watson, Chall. 
Voyage, Zoology, XV. p. 169, pl. 10, fig. 9, 1886. Dall, this Bulletin, XVIII. p. 
205, pl. 15, fig. 4, 1889. 
