8 
Monterey and San Diego, Cal., formerly abundant as now at 
Santo Domingo, Baja California. 
70 Polynices uber 
A single dead specimen was found in False bay, near San 
Diego, Cal., by my son, C. E. Orcutt; one living specimen was 
found at Santo Domingo, and others at San Juan, Baja Cal., and 
at Guaymas, Sonora. Occurs as far south as Peru, South America. 
71 Crucibulum spinosum 
The Cup-and-saucer limpet is weil described by its popular 
name; it is under an inch in diameter, white to brown in color, 
with numerous short spines on its back; inside is a small white 
triangular cup; ofter the spines are worn down or apparently 
absent. 
Common on rocks and shells along bay shores, San Diego, Cal., 
south to Peru; I collected it at Santo Domingo and in the Gulf of 
California, and at Salina Cruz, Oaxaca. 
72 Crucibulum imbricatum 
Recorded from Santa Cruz, Cal., to Chili. I have collected it 
at Santo Domingo and Magdalena Bay, Baja Cal., Manzanillo and 
Salina Cruz, Mexico. Attains a diameter of 2 or 3 inches. 
73 Crepidula unguiformis 
Santo Domingo, Baja Cal., one specimen. 
74 Crepidula dorsata 
Shell about half an inch across, nearly circular, thin, flat, 
wrinkled, brown and white; the small curved deck partly detached. 
Vancouver Island to Chili. Observed on shells collected by 
the pearl divers at Santo Domingo, Baja Cal. Very variable. 
75 Crepidula rugosa 
Santo Domingo, Baja Cal., abundant. 
76 Litorina scutulata 
Greenish gray or nearly black; half inch long, within the aper- 
ture purplish in color; solid. Often with white bands or checked. 
Sitka, Alaska, to Cape San Lucas. The most abundant species 
at San Diego, in sheltered places, on rocks and sea grass; abun- 
dant at Santo Domingo, Baja Cal. 
77 Litorina planaxis 
Nearly globose with an elevated spire; columella flattened; 
often banded with white. 
Cape Mendocino, Cal., abundant on rocks at San Diego, Cal., 
rare at Santo Domingo, Baja Cal. 
78 Cerithidea sacrata 
Abundant in salt marshes and on muddy flats, San Diego, 
Cal.; one dead specimen at Santo Domingo, Baja Cal. 
79 Barleeia subtenuis 
Shell small, slender, reddish-brown, apex obtuse, whorls 4, 
suture distinct, aperture subovate, lip acute, length 2.5 mm. 
Very abundaxt on sea grass at San Diego, Cal., and at Santo 
Domingo, Baja Cal. Also recorded from the Farrallone and Santa 
Barbara Islands, Cal., Cape San Lucas and Mazatlan. 
