Monterey and San Diego, Cal., formerly abundant as now at 

 Santo Domingo, Baja California. 



70 Polvnices 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 Cruciijulum spinosum 



The Cup-and-saucer limpet is well 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 L*itorina 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. 



'9 Barleeia subtenuis 



Shell small, slender, reddish-brown, apex obtuse, whorls 4, 

 suture distinct, aperture subovate, lip acute, length 2.5 mm. 



Very abundant on sea grass at San Diego, Cal., and at Santo 

 Domingo, Baja Cal. Also recorded from the Parrallone and Santa 

 Barbara Islands, Cal., Cape San Lucas and Mazatlan. 



