CLASS GASTROPODA 
53 
Type in United States National Museum, No. 56054. Type locality, 
Neah Bay, Washington. 
Range. Forrester Island, Alaska, to Magdalena Bay, Lower Cali¬ 
fornia. 
Subgenus Dentiscala De Boury, 1886 
Epitonium crenimarginatum Dali, 1917 
Proceedings of the United States National Museum, 53 :473. 
This is larger, much stouter, spirally striated, with a convex smooth 
basal disk, the twelve axial ribs on the last two whorls obsolete on the sides 
of the whorls but coronating the suture. It has six or seven whorls without 
the nucleus, the varix at the aperture is heavy, and there is sometimes 
another heavy varix indicating a resting stage. This has been confused 
with E. crenatoides Carpenter, 1864, from the Gulf of California, which 
is rather small with a coarse spiral rib on the basal disk and has deep 
pits at the intersections of the nine axial ribs. Length, 16; diameter, 7 trim. 
(Dali.) 
Type in United States National Museum, No. 111207. Type locality, 
La Paz, Lower California. 
Range. Monterey, California, to Puerto Libertad, West Mexico. 
Epitonium nesioticum Dali, 1917 
Proceedings of the United States National Museum, 53 :473. 
A smaller species, E. nesioticum Dali, was dredged in sixteen fathoms. 
It has twelve varices, rather feebly carried over the whorls and obsolete 
on the basal disk. Sharp spiral sculpture covers the surface and the 
terminal varix is heavy; there are six whorls, not including a smooth 
nucleus of a whorl and a half; the suture is markedly coronated by the 
ribs. Length, 10.5; diameter, 5 mm. (Dali.) 
Type in United States National Museum, No. 56900. Type locality, 
off Catalina Island, in 16 fathoms. 
Range. Known only from type locality. 
Subgenus Nodiscala De Boury, 1889 
Epitonium spongiosum Carpenter, 1864 
Proceedings of the California Academy of Sciences, 3:222. Supplementary Report, 
British Association for the Advancement of Science, 660. 
O. t. turrita, parva, albida, marginibus spirae rectis; anfr. ix. sub- 
planatis suturis impressis; costis undulantibus circ. xiii., plerumque (nisi 
ad suturas crenulatas) obsoletis; tota superficie lineis punctorum creber- 
rimis spiralibus, punctis creberrimis, minutis, altissimis; cerca basim im- 
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