154 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
times assuming that of Patella pediculus. Generally the apex is at the 
anterior third; rarely at the anterior fourth, with very elongated outline; 
but sometimes is nearly central with a rounded shell. (Gould.) 
Type in ? Type locality, San Francisco, California. 
Range. San Francisco, California, to Socorro Island. 
Described as Patella scabra . 
This has been called A . spectrum by collectors. 
Acmaea sybaritica Dali, 1871 
American Journal of Conchology, 6:257. 
Shell depressed, thin; apex subcentral, more anterior in the young. 
General shape rounded oval, hardly more narrow before than behind. Sur¬ 
face nearly smooth, with rounded concentric lines of growth; in young 
specimens a few faint, hardly noticeable elevated radiating lines or riblets 
may be observed near the margin, which is entire. Internally smooth, 
border polished and also the cavity of the apex above the muscular im¬ 
pressions. Color a clear rose pink, varying from quite deep and a little 
white, even in very young specimens entirely uneroded, rather blunt and 
inconspicuous; sides of the shell ornamented with rays of a darker shade 
of pink, more or less gathered in groups, and more or less evident, accord¬ 
ing to the shade of the remainder of the shell. Internally, the visceral 
area is bluish white, usually washed with a faint yellowish-brown, often 
hardly evident; in which case the area is whitish; the successive layers of 
brown sometimes appear externally around the apex when eroded. The 
inner margin, and to some extent the whole interior, exhibits the external 
markings or rays, through the somewhat pellucid shell. Texture hard and 
brittle. Epidermis exceedingly thin, usually evanescent; translucent brown¬ 
ish. Long., .6; lat., 1.46 in. 
Type in United States National Museum. Type locality, Bering Sea. 
Range. Plover Bay, Eastern Siberia, to Hakodate, Japan, Pribilof 
and Aleutian Islands to Chirikoff Island. 
Acmaea persona Eschscholtz, 1833 
Plate 85, figs. 13, 14 
Zoological Atlas, 5:20; PI. 24, figs. 1, 2. 
Testa ovato-elliptica, convexa, extus rufescente, intus albo-caerulea, 
macula sub fornice fusca, ovato-elliptica alata, vertice excentrice inflexo. 
(Eschscholtz.) 
Der Gipfel ist weit aus dem Centrum herausgeriickt, so dass der vor- 
[ 756 ] 
