\ 
CLASS GASTROPODA 
119 
Crepidula adunca Sowerby, 1825 
Plate 93, fig. 6 
Tankerville, Catalogue of Shells, Appendix 7, No. 828. Keep, West Coast Shells, 207; 
fig. 201. 
C. testa subovali, vertice adunco, margine undata, labio interno septi- 
formi. 
The internal septiform lip divides the cavity nearly in the middle—the 
upper being the smaller portion; this is very deep. (Sowerby.) 
Type in British Museum. Type locality, Monterey, California. 
Range. Vancouver Island, British Columbia, to Cape San Lucas, 
Lower California. 
Crepidula convexa glauca Say, 1822 
Journal, Philadelphia Academy of Natural Sciences, 2:226. Tryon, Manual of Con - 
chology, 8: PI. 36, fig. 9. 
Shell thin, convex, glaucus, with minute transverse wrinkles; apex 
conic, acute, not excurved, but declining and distinct from the margin of 
the aperture; aperture oval-orbicular; within entirely reddish-brown; dia¬ 
phragm plain or convex, less than half the length of the shell, edge widely 
contracted in the middle. Length about half an inch. (Say.) 
Type in Cabinet of the Academy. Type locality, coast of the United 
States. 
Range. Alameda, California. Introduced with Atlantic seed oysters. 
Described as C. glauca. 
Crepidula orbiculata Dali, 1919 
Proceedings of the United States National Museum, 56:251. 
Shell dextral, suborbicular, minutely concentrically wrinkled, white, 
covered with an olivaceous velvety periostracum; whorls about four count¬ 
ing the (lost) nucleus; the apex curved strongly to the right and elevated 
(in the type-specimen) about 4 millimeters above the basal margin; back 
evenly convex; interior subtranslucent white, the edge of the deck promi¬ 
nently produced at the left center with a deep sulcus at the left; there is 
no cavity under the spire between the deck and the margin; height, 26; 
length, 20; width, 17 mm. (Dali.) 
Type in United States National Museum, No. 31100. Type locality, 
Royal Roads, Victoria, Vancouver Island. 
Range. Bering Sea to San Diego, California. 
[ 721 ] 
