336 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 
near the Galapagos Islands, in 885 fathoms, ooze, temperature 37°.2; station 
3431, off Mazatlan, in 995 fathoms, mud, temperature 37°; and station 4654, 
24 miles NW. of Aguja Point, Peru, in 1036 fathoms, mud, temperature 37°.3. 
The National collection also contains a full-grown specimen from southern Chile, 
in about south latitude 50°, which has about six whorls and measures 32 mm. in 
height and 28 mm. in maximum diameter. This specimen was collected by Dr. 
Crawford, and has a heavily callous pillar with a deep chink, but no actual perfor- 
ation, behind it in the umbilical region. The greatest diameter is well up on the 
whorl, which gives the species a peculiar “ shouldered ” aspect. 
Polinices (Huspira) pardoanus Da tt, n. sp. 
Shell small, with about four whorls, white with a straw-colored periostracum, 
depressed turbinate, smooth except for lines of growth and occasional obscure, 
irregular, slightly elevated spiral markings; spire (defective) probably blunt, 
the form of the shell rather wide and depressed; aperture ovate ; outer lip thin, 
obliquely retractive, simple ; body with a marked callus; pillar thick and rather 
wide behind, appressed against the upper part of the umbilicus, the thickened 
part narrower in front, terminating where an impressed spiral line starts at its 
entrance into the umbilical perforation near the anterior edge; umbilicus narrow, 
twisted; the margin of the aperture slightly thickened and compressed. Height 
(about), 13; of last whorl, 10; of aperture, 9; max. diam. 14 mm. 
U.S. 8S. ‘ Albatross,” station 3361, in the Gulf of Panama, in 1471 fathoms, 
ooze, bottom temperature 36°.6 F. U.S. N. Mus. 123,046. Also at station 
3407, near the Galapagos Islands, in 885 fathoms, ooze, temperature 36°.2 F., a 
young specimen apparently of the same species; and a worn but full-grown 
specimen at station 3366, off Cocos Island, Gulf of Panama, in 1067 fathoms, 
ooze, temperature 37°.0 F. 
Although the apex of each specimen is more or less eroded, it is still evident 
that this is a particularly flattened species, which with its milk-white shell and 
yellowish periostracum is sufficiently characteristic. The suture is distinct, but 
neither appressed nor channelled, though, when eroded, the latter is apt to be 
simulated by a channel of erosion. 
Polinices (Huspira) vaginatus Datt, n. sp. 
This species is represented by a number of more or less defective specimens and 
is best described comparatively with P. solutus Gould. 
The shell is white with an olivaceous periostracum; the spire is much flatter 
than in P. solutus ; the furrow at the bottom of which the suture lies is wider and 
is not channelled ; in the young the whorls have a ‘‘ shouldered” aspect, but in 
the adult they are evenly rounded; the umbilicus is cylindrical and reaches nearly 
to the apex of the shell, in so/w¢ws it is barely a narrow chink behind the reflection 
