334 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 
> Cepatia Gray, Syn. Brit. Mus., 1840; cbid., 1844, p. 60; P. Z. S. Lond., 1847, 
p. 149; N. cepacea Lamarck, Eocene. 
Velainta Munier-Chalmas, Annal. de Malac., 1884, 1, p. 335 (= Cepatia Gray). 
> Naticina Fischer, Man. de Conchyl., 1885, p. 766, not of Guilding, 1834. 
> Sigaretopsis Cossmann, Cat. Ilustr., 1888, 3, p. 172; type, NV. infundibulum Wat. 
Kocene (section of Cepatia). 
Polinices in the wide sense, as the oldest available name, includes all the La- 
marckian Naticas with a horny operculum. In considering the subdivisions it 
appears that Huspira Agassiz, which has five years’ priority, notwithstanding some 
discrepancies in the diagnosis, will have to be used in place of the more familiar 
Lunatia of Gray. 
Polinices uber VaALENcIENNES, var. intemerata PHILIPPI. 
Natica uber Val., in Humboldt, Geol. Obs., 1833, 2, p. 266. 
Natica intemerata Philippi, P. Z. 8. Lond., 1851, p. 233; Tryon, Man., 1886, 8, 
p. 46, pl. 18, fig. 83. 
U. 8. 8. ‘ Albatross,” station 3355, Gulf of Panama, in 182 fathoms, mud, 
temperature 54°.1 F. U.S. N. Mus. 123,043. Also at Mazatlan, Mexico, and 
living in Panama Bay, at station 2805, in 51 fathoms. 
Tryon and Carpenter regard this as probably a variety of P. wer, but the 
specimens | have seen seem sufficiently constant to be rated as a good species. 
Polinices (Huspira) agujanus Datz, n. sp. 
Plate 9, figure 2. 
Shell of moderate size, rather heavy, with five whorls, translucent white, with 
an olivaceous periostracum; suture distinct, very minutely channelled; nucleus 
eroded, whorls flattish in front of the suture, with a high, rounded shoulder and 
evenly rotund body; surface smooth except for faint, incremental lines, and, 
under the lens, obscure spiral markings; base rounded, with a wide, deep, sub- 
cylindric umbilicus; aperture semilunar, outer lip thin, simple; the sutural 
angle and the anterior part of the pillar-lip callous, a thin wash of callus on the 
body ; operculum brown, horny, of two whorls. Alt. of shell, 26; of last whorl, 
23; of aperture, 20; max. diam. 24 mm. 
U.S. 8. “ Albatross,” station 4653, 17 miles N. 61° W. from Aguja Point, 
Peru, in 536 fathoms, mud, bottom temperature 41°.3 F. U.S. N. Mus. 110,566. 
The chief peculiarities of this species are the very minute channelling of the 
suture, the flat-topped whorls, and the singular want of callus on the thin, straight 
pillar. The last character may perhaps be altered when the shell is older, though 
otherwise our specimen seems fully adult. A dead and worn specimen, probably 
of this species, was dredged at station 3360, Gulf of Panama, in 1672 fathoms, 
sand, bottom temperature 42°. F. 
