MUSEUM OF COMPARATIVE ZOOLOGY. 221 
332, off Cape Hatteras, in 263 fathoms. Eighteen living and three dead 
(young), Station 336, off Delaware Bay, in 197 fathoms. One living, Station 
338, off Delaware Bay, in 922 fathoms. One dead (young), Station 342, south 
of Martha’s Vineyard, in 1,002 fathoms. 
A very abundant species found by the U. S. F. C. from Flemish Cap to 
off Cape Hatteras, N. C., in 11 to 1,467 fathoms; not living below 1,356 
fathoms. 
Mr. Dall extends the range south to the Barbados, in 288 to 533 fathoms, 
dead. 
Cylichna vortex Dat. 
Utriculus (%) vortex Dall, this Bulletin, IX. p. 100, 1881; XVIII. p. 47, pl. 17, fig. 3, 
1889. 
Non Cylichna (?) Dalli Verrill, Trans. Conn. Acad., V. p. 542, 1882; VI. p. 274, pl. 
29, fig. 15, 1884. 
One dead specimen, Station 305, east of George’s Bank, in 810 fathoms. One 
living, Station 307, east of George’s Bank, in 980 fathoms. 
Found by the U.S. F. C. from east of George’s Bank to off Chesapeake Bay, 
in 326 to 1,356 fathoms ; not living in less than 984 fathoms, or below 1,290 
fathoms. 
In studying the specimens labelled Cylichna Dalli in the F. C. collection I 
found some confusion in the identification, and that two similar but distinct 
forms had been placed under that name: Cylichna Dalli Verrill and Cylichna 
vortex Dall. . 
The differences in the two species are clearly shown in the figures quoted 
above. C. Dalli is most readily distinguished by its “strongly excavated and 
sinuous” columella, which forms anteriorly a distinct fold or tooth-like pro- 
jection where it joins the strongly curved outer lip; while C. vortex has a gently 
curved columella, passing “imperceptibly ” into the outer lip without “twist or 
fold.” 
In this species the apical whorl is smooth, upturned, and sunken in a shallow 
pit formed by the two succeeding whorls, one rising a little above the other, 
with a slightly rounded sutural margin. In some specimens these are so closely 
coiled as nearly to conceal the nucleus, while in others each turn is visible. 
The following turns are more loosely coiled, and the outer lip joins the body 
whorl a little below the apex of the shell. 
Some of the F. C. specimens are considerably larger than Mr. Dall’s types, 
and more slender in proportion to their length. 
One perfect specimen is 164 mm. long and 8 mm. broad; another worn and 
broken one is about 29 mm. long and 13 mm. broad; while still another is 
23 mm. long and 11 mm. broad. 
A careful study of the radula and gizzard shows that the correct position of 
the species is with the Cylichne. 
