514 PROCEEDINGS OF THE NATIONAL MUSEUM. voi,.xxiv. 
The original figure of Gabb is very poor. I have figured a speci- 
men, which has been compared with the original type of Gabb and 
found identical, for comparison with the following species. 
PLEUROTOMA (ANTIPLANES) VINOSA Dall. 
Plate XXXIV, fig. 4. 
I'/eurotoina vinosa Dall, Proc. Cal. Acad. Sci., V, 1874, p. 253. 
Kysku Harbor, Great Kyska Island, Aleutian chain, and in 17 fath- 
oms, Bristol Bay, Bering Sea, at station 3246, by the U. S. Fish Com- 
mission steamer Albatross. The latter figured. U.S.N.M., 122575. 
PLEUROTOMA (ANTIPLANES) PIONA, new species. 
Shell solid, heavy, with a rapidly tapering spire of seven or more 
rotund whorls separated by a distinct suture; nucleus eroded; surface 
covered with a brown periostracum, smooth except for fine obscure 
feeble spiral lines and the lines of increment; aperture short, rounded 
ovate with a short wide slightly recurved canal; pillar solid, Avhite, 
twisted, obliquely truncate in front; outer lip with a shallow anal sinus 
a little in front of the suture; margin thin, simple. Lon. of shell 41, 
of aperture 19; max. diam. 18 mm. Operculum normal, brown. 
Type specimen dredged by U. S. Fish Commission at station 3644, 
in 96 fathoms, sand; bottom temperature 33° F. U.S.N.M., 109179. 
Range from 41 to 81 fathoms in the southern part of Bering Sea, and 
in from 41 to 110 fathoms south of Aliaska peninsula, in the Pacific. 
A fine solid dextral species, not particularly attractive, but with a 
certain symmetry of form. The two following are also dextral. 
PLEUROTOMA (ANTIPLANES) THALiEA, new species. 
Shell solid, heavy, with an elongate spire constricted at the sutures, 
and eight or more whorls; nucleus eroded; surface covered with a 
pale apple green periostracum, which fades in time to a greenish gray; 
surface sculptured only by incremental lines, faint spiral lines, a slight 
depression of the anal fasciole, and irregular, feeble, broken, short 
elevated lines which are scattered over the surface and usually directed 
at right angles to the incremental lines; aperture short and narrow, 
with a short and wide canal; outer lip with a deep anal sinuosity, leav- 
ing a slightly depressed fasciole behind it; anterior part of the outer 
lip much produced and rounded, thin and simple; pillar stout, white, 
short, obliquely truncate in front; canal wide, short, slightly fiaring; 
base somewhat constricted, with the spiral strise stronger than on the 
rest of the surface. Lon. of shell 40, of aperture 15; max. diam. 12 mm. 
Operculum normal. 
Type specimen dredged ofl:' San Luis Obispo, California, bv. the 
U. S. Fish Commission steamer Albatross at station 3195, in 252 
fathoms, nuid; ))ottom temperature 43°. 2 F. U.S.N.M., 122568. 
