328 University of California Publications in Zoology — [Vou. 14 
CERITHIOPSIDAE 
Cerithiopsis Forbes 
[ Cerithiopsis, sp. | 
The similarity of the names of the eastern species C. tubercularis 
(Montagu) with that of C. tuberculoides Carpenter apparently con- 
fused Cooper, also Blankinship and Keeler in reporting the former 
species from the Farallon Islands. Since Carpenter’s form has a 
known range such as to make it improbable that it occurs as far north 
it is possible that those authors obtained C. columna Carpenter, which 
is known to have a range such as to include these waters. 
CYPRAEIDAE 
Trivia Gray 
Trivia californica Gray 
Trivia californica Gray, Tryon (1885b), p. 202, pl. 22, figs. 18, 19, 20, 37; 
Blankinship and Keeler (1892), p. 153. 
Description.—This form has been redefined by Tryon as follows: 
‘“Ovate, rather globose; ribs distant, dorsal impression faint, whitish, teeth 
whitish.’’ 
This species has been reported from the Farallon Islands by Cooper 
and by Blankinship and Keeler. It is not among the Survey collec- 
tions. 
Range.—Farallon Islands (Cooper); San Diego, California (Or- 
eutt). 
Erato Risso 
Erato vitellina Hinds 
Erato vitellina Hinds (1844a), pl. 13, figs. 22, 23; Tryon (1883c), p. 10; 
Blankinship and Keeler (1892), p. 153. 
Description.—Characterized by Tryon (1883) as follows: 
““Obesely ovate, aperture rather wide, dark red, lighter on the thickened lip- 
margin.’’ 
This species is known from this region only through the report of 
Blankinship and Keeler. 
Range.—San Francisco (Blankinship and Keeler) ; southern Cali- 
fornia to Acapuleo, Mexico (Tryon). 
