CLASS GASTROPODA 
65 
Epitonium acrostephanum Dali, 1908 
Proceedings of the United States National Museum, 34:251. 
Shell slender, acute, turreted, with two nuclear and nine or more 
subsequent whorls which are in contact, though separated by a deep 
suture across which the varices are continuous; axial sculpture of (on 
the last whorl, fourteen) 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; 
anterior face of the varices is concentrically sharply striate, and the por¬ 
tion which approaches the center of the base is slightly flattened, although 
there is no basal disk or perforation; the space between the varices is 
smooth and polished, but under a lens shows traces of faint spiral stria- 
tion, more or less irregular; the aperture is rounded-ovate, the peritreme 
thin and like the preceding varices; the operculum is thin, of about three 
whorls, concave and centrifugally striated, of a pale horn color. Height, 
of shell, 20; of last whorl, 8.5; of peritreme, 4.5; maximum diameter, 
6.5 mm. (Dali.) 
Type in United States National Museum, No. 110638. Type locality, 
Monterey, California. 
Range. Monterey, California, to Coronado Islands. 
Epitonium catalinae Dali, 1908 
Proceedings of the United States National Museum, 34:252. 
Shell slender, white, turreted, imperforate, with more than seven 
adherent whorls; nucleus (lost) ; suture distinct, closed; varices (on the 
last whorl, fourteen) continuous, making nearly one revolution around the 
axis in ascending the spire; they are flatly reflected, axially striate, sub- 
spinose at the shoulder, giving a tabulate aspect to the rounded whorls. 
There is no basal disk on the whorl, but on the basal part of each re¬ 
flection of the varies there is a smooth area over which the suture travels, 
and which, taken collectively, gives the effect of segments of a disk im¬ 
posed on the varices but not on the whorl; below the shoulder the varices 
are widely reflected, extending for a space to the angle of reflection of 
the preceding varix, where it would seem these extensions are normally 
attached, covering a hollow space between them and the whorl, but in 
the type-specimen most of these extensions are broken away; aperture 
subcircular. Height, of (decollate) six whorls, 12.0; of last whorl, 6.0; 
of aperture, 2.7; maximum diameter, 4.5 mm. (Dali.) 
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