1894. 



PROCEEDINGS OF THE NATIONAL MUSEUM. 153 



C. simillima, are common species as far north as San Diego and San 

 Pedro. Pichilinqne Island, nuraerons examples, living; Albatross. 



VP:NIIS (CHIONK) XE(JLKC'PA, Ci r)><-ii t .r. 



Not uncommon. 



Boca de los Piedras (No. 7;^917, TT. S. N. M.); Magdalena Bay (No. 

 63004, U. S. N. M.); Cape St. Lucas (No. 23558, IT. S. N. M.), Dr. Pal- 

 mer ("^) Oerros Island (No. 13650, U. S. N. M.). 



Plight, all juniors at the tirst place, numerous examples at the others. 



VENUS ((nUONE) COLITMBIENSIS, St)W(>iby. 



Several examples, 



Mazatlan (No. 03594, U. S. N. M.), H. Edwards (No. 2431, U. S. N. M.)! 

 Rich collection. Upon a revision of this grou]), tlie position of the above 

 species may have to be changed. 



VENUS ( CHIONE ) GNIDIA . K r <> d e r i ]> n n d S o w e r b y . 



Numerous examples. 



Guaymas (No. 23498, U. S. N. M.), Palmer; Mulege Bay (No. 2501, 

 U. S. N. M.); La Paz (No. 34083, U. S. N. M.), I'.elding; San Ignacio 

 Lagoon (No. 105597, U. S. N. M,), Hemphill. A fine species and com- 

 paratively abundant. 



CY'THEREA (CALLIfeTA) CHION^A, Menke. 



Two adolescent examples. 



La Paz (No. 03524, U. S. N, M.); Scammon's Lagoon; San Juanico; 

 Loreto; Pichilinqne Bay (common), and Sta. Margarita Island (valves); 

 Station 2828, two fresh specimens in 10 fathoms, Albatross. 



This common species is found at a great many places in the Gulf and 

 on the outer shore of the peninsula of Lower California. Gabb col- 

 lected it at San Juanico, also at Loreto on the Gulf side (No. 03525, 

 U. S. N. M.), It is frequently found in large numbers on Carmen Island, 

 cast up on the beach after a storm. A rare and beautiful variety, 

 resembles in its color markings the Asiatic Cytlierea petichialis, which 

 has led to said species being credited to the w^est coast of America. 



CYTHEREA (CALLISTA) AURANTIA, Hiiiiley. 

 Three valves in good condition. Pichilinqne Bay, Albatross. 

 CYTHEREA (CALLISTA) POLLICARIS, Carpenter. 



One specimen. Mulege Bay (No. 03538, U. S. N. M.). 



The example collected at the above place by Mr. Fisher I refer to 

 Carpenter's species, on the basis of form and sculpture. Carpenter's 

 type was collected by Xantus at Cape St. Lucas (No. 12721, U. S. N. M.); 

 it is a large, white, smooth-surfaced shell, measuring laterally 03 mm. 

 by 57 mm. from umbos to the ventral margin of the valves; while 



