CLASS GASTROPODA 
61 
Epitonium densiclathratum Dali, 1917 
Proceedings of the United States National Museum, 53 :478. 
Shell white, solid, with six or eight well-rounded whorls exclusive 
of the (lost) nucleus; varices ten or eleven, sharply axially grooved 
on their anterior faces, solid, thick, not continuous over the suture, on 
the base showing a slight flattening, though there is no basal cord or disk; 
aperture ovate; behind the inner margin there is a narrow flattened area 
reflected over the umbilical region in the type-specimen. Length, 17; 
diameter, 7.5 mm. (Dali.) 
Type in United States National Museum, No. 111209. Type locality, 
Puget Sound, Washington. 
Range. Neah Bay, Washington, to San Diego, California. 
Epitonium crebricostatum Carpenter, 1886 
Proceedings of the California Academy of Sciences, 3:222. 
S. t. gracili, tenui, alba; anfr. x rotundatis, haud attingentibus; costis 
circ. xv, acutis, reflexis, vix attingentibus, lineis irregulariter spiralibus 
ascendentibus; costis juxta suturam eleganter coronatis; sculptura spirali, 
nisi striulis interdum exillimis, nulla; apertura rotundata; umbilico nullo; 
operculo normali, dense corneo. Long., 0.70; long, spir., 0.52; lat., 0.18 mm. 
(Carpenter.) 
Shell slender, thin, white; with ten rotund whorls, scarcely touching; 
with about fifteen acute reflexed lines, scarcely touching each other, in 
regular ascending spirals; ribs near the suture elegantly carinate; no 
spiral sculpture except sometimes very thin striations; aperture rotund, 
no umbilicus. Operculum normal, densely horny. (Translation.) 
Type in California State Collection, No. 393. Type locality, Mon¬ 
terey, California. 
Range. Vancouver Island to Gulf of California. 
Epitonium catalinense Dali, 1917 
Proceedings of the United States National Museum, 53:481. 
Shell with a small three-whorled nucleus, smooth and white, and seven 
and a half subsequent whorls; varices twenty-two to twenty-four, not 
spinous or angular, not regularly continuous over the suture, with the an¬ 
terior faces of the varices finely lamellose or deeply striated. Base rounded 
with a minute umbilical perforation in the adult; aperture nearly circular. 
Length, 13.5; diameter, 6 mm. (Dali.) 
It differs from sawinae by the absence of angularity on the greater 
number of the varices, and by the umbilical perforation. (Dali.) 
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