CLASS GASTROPODA 
57 
slightly produced in front and near the suture. Length, 7.5; diameter, 
3.5 mm. (Dali.) 
Type in United States National Museum, No. 253024. Type locality, 
Laguna Beach, California. 
Range. Known only from type locality. 
Epitonium arnoldi Dali, 1917 
Proceedings of the United States National Museum, 53:475. 
Shell of moderate size, white, thin, with eight well-rounded whorls 
exclusive of the (lost) nucleus; varices on the last whorl thirteen; on 
the first four whorls they are feeble, on the next two distinct and crowded, 
on the last two more distinctly spaced, low, cord-like; spiral sculpture 
of extremely fine, close-set striae; terminal varix not enlarged, the varices 
not continuous over the suture, not enlarged or spinose; aperture obliquely 
ovoid. Length, 14; diameter, 5.5 mm. (Dali.) 
Type in United States National Museum, No. 106875. Type locality, 
beach at San Pedro, California. 
Range. Known only from type locality. 
Subgenus Cirsotrema Morch, 1852 
Epitonium montereyense Dali, 1907 
Nautilus , 20:28. 
Shell small (probably not full grown), the nucleus lost but with five 
subsequent rapidly increasing whorls; shell substance in two layers, the 
inner translucent white, solid, the outer opaque white, frothy, porous, 
with numerous puncticulations arranged in harmony with the incremental 
lines, except on the basal disk where they form spiral lines; varices low, 
solid, with a spongy surface, nine in number; basal disk conspicuous, 
slightly concave; bordered by a conspicuous cord; aperture gibbous, patu¬ 
lous near the imperforate axis. Long., 2.5; diameter, 1.5 mm. (Dali.) 
Type in United States National Museum, No. 110431. Type locality, 
Del Monte, in Monterey Bay, in 25 fathoms. 
Range. Monterey to San Pedro, California. 
Subgenus Nitidoscala De Boury, 1909 
Epitonium indianorum Carpenter, 1865 
Annals and Magazine of Natural History, series 3, 15:31. Tryon, Manual of Con - 
chology, 9; PI. 14, fig. 48. 
S. testa gracili, turrita, alba; anfr. circ. x., rotundatis, parum separatis, 
laevibus; basi simplici, haud umbilicata; costis viii-xv (plerumque xii), 
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