25 
Volume 21. Number 4. April, 1919. Whole Number 168. 
A Popular Review and Record for the Pacific Coast. 
The oldest scientific magazine west of the Mississippi. 
SUBSCRIPTION PRICE: $3.00 per volume (of about 200 pages). 
Current or back numbers 25 cents each (as far as available; 
number 1 has been reprinted, and other out-of-print num- 
bers will be reprinted as the demand may justify). 
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Charles Russell Orcutt 
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21:0227 NODISCALA De Boury, 1889. (Opalia fide Cpr.). Sub- 
genus Epitonium. 
Small, slender imperforate shells, with ill-defined axial nodes 
or ribs, but only one true varix, which is terminal and much 
thickened; when in good condition have a soft calcareous outer 
coat which is punctate or minutely sculptured, recalling the outer 
coat of Chlamys. 
21:0228 Epitonium (Nodiscala) mazatlanica Dall, 1908. (1467). 
21:0229 Epitonium (Nodiscala) retiporosum Cpr. 1864. (959, 
1061). 
This occurs from Catalina Island and San Pedro, Cal., to 
Gulf Cal. 
21:0230 Epitonium (Nodiscala) spongiosum Cpr. 1864. (960). 
21:0231 Epitonium (Nodiscala) mexicanum Dall, 1898. (1468). 
21:0232 ACIRSA Moerch, 1857. 
Type:—Scalaria borealis Beck, 1839 (non Gould). 
(21:232) Arcisa Nyst, 1873. 
Shell turreted, thin, whorls united, varices obsolete, outer 
lip thin, simple. 
21:0233 Epitonium (Acirsa) borealis Beck, 1839 (non Gld.). 
(21:233) Scalaria eschrichtii (Holboll) Moeller, 1842. 
(21:233) Scalaria ochotensis Middendorf, 1849. 
Circumboreal; Okhotsk Seas; Aleutian Islands. Dall speaks 
of the more southern shells as more delicate and smaller than 
those from the Arctic waters, which at most form a variety which 
will take Middendorf’s name. 
