200 SHELLS OF LOWER CALIFORNIA— STEARNS. vol.xvii. 



Boca de los Piedias (Xo. 32505, U. S. N. M.); Cape St. Lucas (No. 

 32506, U. S. N. M.), and elsewhere in the Gulf region. 



Family Neritid^. 

 NERITA SCABRICOSTA, Lamarck 



Several examples. 



Pichilinque Bay; Santa Margarita Island, A iftcriross; Common also 

 at the Galapagos Islands. Often of very large size; varies much in 

 elevation. 



NERITA BERNHARDI, R e c 1 u z . 



Abundant. 



Tres Marias; also Mulege Bay (Nos. 32702, 60337, U. S. N. M.), where 

 it is exceedingly numerous ; also at Pichilinque Bay, Ballenas Bay, and 

 Margarita Island, Albatross. Common at Panama. 



NERITINA PICTA, S o w e r b y . 



Common. 



La Paz; Loreto, and elsewhere in the Gulf; frequently exhibits very 

 beautiful color varieties; extends up the outer coast of Lower Cali- 

 fornia, and south to Panama and beyond. Pichilinque Bay, Albatross. 



Snperfamily ZYGOBRANCHI^TA.. 



Family Fissure llid^. 



FISSURELLA NIGROCINCTA, Carpenter. 



One example. Gulf of California (No. 59241, U. S. N. M.). 



FISSURELLA VOLCANO, Reeve. 



=:F. ornata, Nittai.l. 



Abundant. 



Tres Marias (No. 48166, U. S. N. M.). San Juanico, Gabb (No. 48165, 

 U. S. N. M.); Ballenas Bay, Albatross; Yeutosa Bay, Tehuantepec, 

 Sumichrast (No. 60440, U. S. N. M.). Though darker colored than tlie 

 more northerly Monterey specimens of F. volcano, which are nearly 

 white inside and show more or less of a reddish or pinkish color exter- 

 nally, I regard the specimens from the two localities as belonging to 

 the same species. Specimens in the collection from intermediate points 

 seem to connect them. 



FISSURIDEA MURINA, Carpenter, 



Several examples. 



