CLASS GASTROPODA 
111 
Family CAPULIDAE 
Genus CAPULUS Montfort, 1859 
Shell conical, apex posterior, spirally recurved; aperture rounded; 
muscular impression horseshoe-shaped. (Tryon, Structural and System¬ 
atic Conchology.) 
Type. Capulus hungaricus Linnaeus. 
Distribution. West Indies, Europe, India, Australia, West America. 
Fossil, Silurian .... 
Capulus californicus Dali, 1900 
Plate 91, figs. 15, 16 
Nautilus, 13:100. Bulletin 112, United States National Museum; PI. 15, fig. 6. 
Shell only moderately elevated, oval or more or less conformable with 
the object upon which it roosts, the apex small, somewhat laterally com¬ 
pressed, incurved almost symmetrically, nearly concealing the smooth, one- 
whorled nucleus, situated near the posterior margin; surface nearly 
smooth, somewhat irregular, mesially with small faint radial not very 
close-set ridges, covered with an imbricated, dense, soft, glistening peri- 
ostracum which projects beyond the margins; interior polished, white, with 
faint rosy rays extending from the apex to the anterior margin. Alt., 10; 
long., before the apex, 30; behind it, 5.5; total basal length, 36.5; average 
width, 29 mm. (Dali.) 
Type in United States National Museum. Type locality, on Pecten 
diegensis from off San Pedro, California, in 20-25 fathoms. 
Range. San Pedro to San Diego, California. 
Genus PILISCUS Loven, 1859 
Shell thin, patelliform, with thin epidermis; apex not spiral, somewhat 
inclined to the right and posteriorly. (Tryon and Pilsbry, Manual of Con¬ 
chology. ) 
Piliscus Loven, 1859, and Pilidium Middendorff, not Forbes. 
Distribution. Boreal Seas. 
Piliscus commodus Middendorff, 1851 
Sibirische Reisc, 2:214; PL 17, figs. 4—11. 
Es sind mir im Okhotskischen Meere nur zwei Schalen dieses Weich- 
thieres aufgestossen, deren grossere zum Gliicke auch das Thier enthalt. 
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