152 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
dull, lusterless, whitish, with stripes and zigzags of blackish-brown. The 
apex is usually decidedly anterior and elevated; the front ribs are obso¬ 
lete, the posterior ribs strong, rounded, often uneven. Inside margin con¬ 
spicuously tessellated; central area generally dark and rather narrow. 
This is the oregona of Authers, and probably radiata of Eschscholtz. 
It resembles the striped variety of the Chilean A . ceciliana so closely that 
it would be absolutely impossible to separate a mixed lot. (Tryon and 
Pilsbry, Manual of Conchology.) 
Type in St. Petersburg. Type locality ? 
Range. Aleutian Islands to Monterey, California. 
Acmaea digitalis umbonata Reeve, 1855 
Conchologia Iconica, 8: fig. 107. 
Shell globosely convex, apex altogether anterior, sharply hooked, radi- 
ately ridged, ridges few, irregular, obtusely crenated; ash-black, sculp¬ 
tured with white impressed punctate, punctures more numerous toward 
the margin, interior bluish-white, chestnut in the middle. (Reeve.) 
Type in Museum Cuming. Type locality, Upper California. 
Range. Saginaw Bay, Alaska, to California. 
Acmaea digitalis textilis Gould, 1846 
Proceedings of the Boston Society of Natural History, 2:152. Mollusca and Shells 
of the United States Exploring Expedition, PI. 29, fig. 456. 
Testa depressa, oblique conica; apice anteriori, acuto; costis latis, ele- 
vatis, subplanulatis, nodosis ad 15 radiantibus; epidermide viridi, punctis 
albidis quadratis reticulato; basi ovato-rotundato, limbo marginali albido 
et fusco-viridi fimbriato: facies interior albida; fundo piceo. Long., 1; 
lat., 24; alt., %o i n * (Gould.) 
Type in State Museum, Albany, No. 6347. 
Range. Crescent City, California, to Cedros and Socorro Islands. 
Acmaea limatula Carpenter, 1864 
American Journal of Conchology, 2:340. Tryon and Pilsbry, Manual of Conchology, 
13:14; PI. 3, figs. 38-40. 
Extus sculptura normali; seu intensiore, lirulis quibusdam majoribus, 
valde nodosis; intus albida, nitida; limbo lato nigro, seu rarius tessellato; 
spectro saepius fusco maculato. (Carpenter.) 
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