CLASS GASTROPODA 
153 
Outer layer of the shell black, covered with an olive-green, or some¬ 
times light bluish, epidermis; inside border black; a deep brown central 
spot. (Tryon and Pilsbry, Manual of Conchology .) 
Type in ? Type locality, San Pedro, California. 
Range. Crescent City, California, to Cerros and Socorro Islands. 
Described as Acmaea scabra limatula. 
Acmaea limatula morchii Dali, 1878 
Proceedings of the United States National Museum, 1:47. 
Shell conical, much elevated, with a subcentral recurved apex re¬ 
sembling that of Helcion pectinatus covered with close-set, rough, imbri¬ 
cated ribs and riblets, the coarse, imbricated, sharp lines of growth forming 
with the other sculpture a close reticulation in some specimens. Interior 
with a brown-mottled spectrum and margin, otherwise white; exterior dull 
grayish or greenish speckled. The imbrications on the principal ribs very 
strong, in some specimens forming small spines concave beneath. Lat., 16; 
long., 20; alt., 10 mm. (Dali.) 
Type in United States National Museum, No. 31268. Type locality, 
Tomales Bay, California. 
Range. Known only from type locality. 
Acmaea scabra Gould, 1846 
Proceedings of the Boston Society of Natural History, 2:152. Tryon and Pilsbry, 
Manual of Conchology, 13: PI. 3, figs. 41-44. 
Testa parva, scabra, per-inequilateralis, oblique arcuato-conica, pallide 
virens, nigro diversemode virgata, costis radiantibus scabrosis ad 15 or- 
nata; basi ovata: facies interna albida; fundo piceo, limbo marginali viri- 
dulo et piceo fimbriato. Long., % ; lat., Y ; alt., poll. (Gould.) 
Apex rather anterior; slopes rather straight; sculptured with very 
strong, close, rough ribs, with smaller intervening riblets; center of the 
inside white, with dark spots and bars. Normally it is solid, rather 
depressed, with from 20-30 very strong, rounded ribs not evanescent 
anteriorly, the interstices being occupied by intercalary riblets. The color 
is white, with fine lines of brown (not striped as in pelta and persona) ‘ 
between the principal ribs, which delicately dot the otherwise uniform 
livid in some specimens, especially the young, to a very faint pink. Apex 
white margin. Sometimes the principal ribs are rather sharp, palmating the 
margin; occasionally they are small and crowded, becoming faint at the 
margin, when the shell presents the internal aspect of A. mitella; at other 
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