BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Hipponix serrata CARPENTER. 
Hipponyx serratus Carpenter, Maz. Cat., 1856, p. 296. 
U. S. S. “ Albatross,” station 2798, in Panama Bay, in 18 fathoms, Mazat- 
lan, Reigen. U.S. N. Mus. 110,654. 
Naticidae. 
NATICA Scororr. 
Natica Scopoli, Intr. Hist. Nat., 1777, p. 392 (after Adanson); type, N. vitellus 
(Linné) ; Lamarck, Prodr., 1799, p. 77; sole ex., N. canrena Linné. 
The forms with calcareous opercula having been indicated by Lamarck as typ! 
cal, we may, as I have indicated in my Report on the Oregon Miocene, subdivide 
the group in part as follows : 
Natica 8.8. Umbilicus open, with a spiral ridge internally ; operculum externally 
spirally multisuleate. N. vitellus Linné. 
Cochlis Bolten, 1798. Umbilicus similar to that of Natica s. 8. Operculum with 2 
very few, or only a single marginal sulcus. N. spadicea Gmelin. 
Cryptonatica Dall, 1892. Operculum smooth, without spiral sulci, umbilicus € 
pletely closed with a smooth pad of callus. N. clausa Brod. and Sowerby: 
om- 
The first and second groups are tropical or subtropical; the last is cool-temper 
ate or arctic. There are several other groups, such as Nacca, Stigmaulax, 4” 
Payreaudeautia, but these are not represented in the present collection. 
Natica (Cochlis) othello Darz, n. sp. 
Shell rather thin, elevated, with a rather pointed spire of four and a half whorls 
of which four are nuclear, smooth, and brownish, the remainder buff, very pale 
brown, or grayish-white, with a polished surface; suture very distinct, not chan- 
nelled or appressed; periostracum dehiscent, chaffy, pale yellowish-brown ; an 
obscurely defined whitish band in front of the suture and at the base ; axial sculp- 
ture of sharply incised, numerous retractive lines, forming a halo in front of the 
suture and behind the shoulder of the whorl; there are about two or three ? 
these radii to the millimeter and they average about four millimeters long 0n tho 
last whorl, with wider, radially striated interspaces ; the remainder of the whorl 18 
smooth, except for faint incremental lines, and more or less obscure, obsolete, 
spiral striation ; umbilicus narrow, with a nearly vertical, strong spiral internal 
rib, nearer the anterior wall of the umbilicus; aperture oval, outer lip sharp, thins 
body with a moderate white callus, interrupted in front by the umbilicus ; pillar 
white, throat, livid flesh-color; operculum shelly, of two and a half whorls, inter 
nally smooth and slightly convex, externally flattish, apically depressed, white, wit 
