246 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
\ 
Fissurella volcano crucifera Dali, 1908 
Proceedings of the United States National Museum, 34:256. 
A peculiar color-variety of this species has been sent to me from the 
Pacific coast a number of times in the hope that it was something new, 
and it seems worthy of a varietal name. The shell is as usual, except in 
color, the ground color being a brownish gray, with darker maculae, while 
from the apex start four broad white rays at right angles to each other, 
the posterior ray rapidly becoming V-shaped, the others remaining entire, 
each ray reaching four or five millimeters in length, and the anterior and 
posterior rays being in the longer axis of the shell. (Dali.) 
Type in United States National Museum, No. 199171. Type locality, 
San Pedro, California. 
Range. Monterey to Lower California. 
Family LEPIDOPLEURIDAE 
Genus LEPIDOPLEURUS Risso, 1826 
Insertion plates absent. Girdle with minute, gravelly, smooth or stri¬ 
ated scales, usually with a marginal fringe of longer scales. (Tryon and 
Pilsbry, Manual of Cotichology.) 
Type. Lepidopleurus cajetanus Poli. 
Distribution. North Atlantic and Arctic Seas, Britain, Norwegian 
coast, Greenland, south to Gulf of Lyons, Vigo, Spain, North Pacific, 
Alaska, West Indies, Mediterranean, California, Japan. 
Lepidopleurus cancellatus Sowerby, 1839 
Conchological Illustrations, Chiton, figs. 104, 105. Tryon and Pilsbry, Manual of 
Conchology, 14:3; PI. 3, figs. 54-58. 
Shell small, elongated, much elevated, regularly arched, not angled. 
Orange-ashen or whitish. Anterior valve radiately, evenly, very finely gra- 
nose-lirate. Central areas of the intermediate valves having distinct longi¬ 
tudinal, fine, close granulous lirae, the granules being sometimes arranged 
in transverse lines also, giving a latticed appearance; lateral areas distinct, 
decidedly raised, convex, having radiating but rather irregular rows of 
granules. Posterior valve with central elevated apex; posterior slope con¬ 
cave. Interior white, the sutural plates small, triangular; jugal sinus very 
broad. Girdle narrow, densely beset with delicate, scarcely imbricating or 
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