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(21:217) Psychrosoma Tapparone Canefri, 1876. 
21:0218 Epitonium (Opalia) wroblewskii Moerch, 1876. (958). 
(21:218) Scalaria borealis Gould, 1852 (non Beck, 1839). 
A very solid white shell with 7 or 8 varices, more conspicu- 
ous on the early part of spire, and a well marked basal disk. 
Forrester Island, Alaska, to San Diego, Cal. (in 53 fms.); also 
in the Pleistocene of Southern California. 
21:0219 Epitonium (Opalia) varicostata Stearns, 1875 (non 
Sacco, 1890). 
(21:219) Opalia varicicostata Cossman, 1912. 
A large species, with 10 or 12 ribs, sometimes partly obso- 
lete, from the Pliocene, San Diego, Cal. 
21:0220 Epitonium (Opalia) anomala Stearns, 1875. 
(21:220) Crassiscala anomala De Boury. 
Pliocene, San Diego, Cal., without varices, except sometimes 
near tip of spire. 
21:0221 Epitonium (Opalia) pluricostata Dall. Neeah bay, Wash. 
Resembles the ribbed upper portion of E. wroblewskii, but 
is smaller and more cylindrical; 7 whorls without the nucleus, 
the 8 varices continuous up the spire, the interspaces smooth, the 
basal disk octohedral from the intersection of the ribs, somewhat 
concave, and relatively smaller than in wroblewskii; length 16, 
diameter 5mm. Forrester Island, Alaska, to San Diego, Cal. 
21:0222 DENTISCALA De Boury. (Opalia fide Cpr.). Subgenus 
Epitonium. 
21:0223 Epitonium (Dentiscala) crenatoides Cpr. 1864. Gulf 
Cal. (198). 
21:0224 Epitonium (Dentiscala) crenimarginata Dall. La Paz. 
Monterey, Cal., to Puerto Liberatad, Sonora, generally con- 
fused with E. crenatoides, but much more common, larger, much 
stouter, spirally striated, with a convex smooth basal disk, the 
12 axial ribs on the last 2 whorls obsolete on the sides of the 
whorls but coronating the suture; whorls 6 or 7 without the 
nucleus, the varix at aperture heavy, sometimes another heavy 
varix indicating a resting stage; length 16, diameter 7 mm. 
21:0225 Epitonium (Dentiscala) insculpta Cpr. 1864. (474). 
Without the fine spiral surface sculpture, somewhat inter- 
mediate between the last two species. Pleistocene, Santa Bar- 
bara, Cal. 
ee Epitonium (Dentiscala) nesiotica Dall. Catalina Island, 
al. 
The 12 varices rather feebly carried over the whorl and ob- 
solete on the basal disk; sharp spiral sculpture covers the sur- 
face and the terminal varix is heavy! whorls 6 not including a 
smooth nucleus of a whorl and a half; suture markedly coronated 
by the ribs; length 10.5, diameter 5 mm. 
