102 
nucleus with the surface eroded; suture distinct, the whorl in 
front of it somewhat tabulated by an obscure angle from which 
the spires arise; axial sculpture, besides incremental lines, only of 
about (on the last whorl) 10 sharp depressed lamellar varices, 
prominent only behind the periphery and feeble on base; at the 
shoulder these are produced into high, usually recurved, guttered 
spines, which in some cases are nearly straight, in others curved 
toward the preceding whorl until they may even touch it; aper- 
ture ovate, canal long, slender, slightly recurved. Height 19.5, 
of last whorl (without the spines) 14.5, of aperture and canal 
11.5, max. diam. 6.5 mm. 
Type locality:—off San Diego harbor, Cal., in 20 fms. (F. W. 
Kelsey). 
Named in honor of Dr. Charles S. Bentley. 
1465 Columbella (Anarchis) petravis Dall. 
Shell minute, blunt, solid, varicolored, chiefly purplish or flesh 
color, but distributed much like the colors of Amphissa versicolor, 
either solid or in pattern; whorls about 6, the nucleus including 
2 of these which are smooth, polished, swollen, and apically 
blunt; suture distinct, appressed, the whorl in front of it (last 
whorl) slightly constricted; sculpture of (on the last whorl about 
16) small, subequal, rounded, slightly flexuous ribs, distally pro- 
tractive, and with narrower, microscopically faintly spirally stri- 
ated interspaces; the last whorl terminates in a pale-colored thick- 
ening, or indistinct varix; aperture and canal very short and 
wide; outer lip internally with a few indistinct lire; pillar smooth, 
obliquely attenuated in front. Height 4.5, last whorl 2, aperture 
1.4, max. diam. 1.7 mm. 
Type locality:—Bird Rock Beach, San Diego, Cal., under 
stones (F.. W. Kelsey). 
1466 Columbella (Anachis) Arnoldi Dall. 
Synonymy:—Columbella minima Arnold (name preoccupied). 
From the Pleistocene of San Pedro, Cal. 
1467 Opalia (Dentiscala) Mazatlanica Dall. 
Type locality:—Mazatlan, Sin., Mexico. 
1468 Opalia (Dentiscala) Mexicana Dall. 
Type locality:—Acapulco, Mexico (W. H. Dall). 
1469 Epitonium ‘(Crisposcala) acrostephanus Dall. 
Shell slender, acute, turreted, with 2 nuclear and 9 or more 
subsequent whorls which are in contact, tho separated by a deep 
suture across which the varices are continuous; axial sculpture of 
(on last whorl 14) nearly vertical, thin, sharp, slightly reflected 
varices, which are expanded near the suture into a small lamella 
of which the posterior corner, when intact, bears a small, sharp 
spine, behind which the varix is much attenuated and turns into 
the suture, which it crosses and becomes connected with one of 
the varices of the preceding whorl; the anterior face of the var- 
ices is concentrically sharply striate, and the portion which ap- 
proaches the center of the base is slightly flattened, although 
there is no basal disk or perforation; the space between the var- 
ices is smooth and polished, but under a lens shows traces of 
faint spiral striation, more or less irregular; the aperture is 
rounded-ovate, the peritreme thin and like the preceding varices; 
the operculum is thin, of about 3 whorls, concave and centrifugal- 
ly striated, of a pale horn color. Height of shell 20, of last whorl 
