ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 667 
Chione pulicaria, Shy., var.,= V. Pinacatensis, Sloat MS. Sculpture pressed 
smooth in the middle. 
Cardium elatum. Fine. 
Cardium procerum. Fine. 
Modiola capax. “Choros.” Also Sta. Inez Bay. 
Modiola Brasiliensis. (Typical.) 
Byssoarca Pacifica. 
Ostrea conchaphila et amara, Maz. Cat. 215. 
Chiton (Lophyrus) Stokesit. Also San Salvador, Capt. Dow. 
Callopoma fluctuatum. 
Bivonia contorta. 
Turritella goniostoma. 
Turritella tigrina (light var.),=leucostoma, Val. 
Cerithidea albonodosa. Common. {Probably a var. of Mazatlanica. | 
Strombus gracilior. Also Mulege Bay. 
Neverita Recluziana. (Operc. strong, horny. | 
Ranella triquetra. {Operc. sub-Buccinoid, oval ; nucleus internal, near middle 
of labrum ; scar with few ridges, as in Purpura. | 
Oliva angulata. Not rare. 
Oliva Cumingti, very callous var. 
Agaroma testacea. 
Monoceros lugubre. Very tall var. 
Phyllonotus nigritus. Very large, of form described by Philippi, with Pholads 
m situ. Agiobampo Bay. 
Phyllonotus bicolor. (Operc. thin, without frills or raised layers ; of uniform 
colour.] Also Angeles Bay. 
To these may be added, from a second voyage by Capt. Stone to the 
northern part of the Gulf of California, and in equally good condition— 
Arca grandis. Agiobampo Bay. 
Callista semilamellosa. Agiobampo Bay. 
Lazaria pectunculus (teste Cuming). St. Luis Bay. 
Cardium consors. St. Luis Bay. 
Avicula Peruana. Mulege Bay. 
Incina tigerrina. Very fine. San Marcos Island. 
Margaritiphora fimbriata. * Topo.” 
Janira dentata | =excavata, Val.|. ‘“ Caballito del mar,” St. Luis Bay. 
Bulla nebulosa. ‘ Huevitos.” 
Glyphis inequalis. St. Luis Bay. 
Crucibulum imbricatum. St. Luis Bay. 
Cyprea exanthema. (Large.) Cape de Haro. 
Myurella variegata. Mulege Bay. 
Solarium granulatum et var. quadriceps. Agiobampo Bay. 
Polinices bifasciata. Angeles Bay. 
Cyprecassis tenwis [= Marsene, Kien.]. Carmen Island. 
Harpa crenata. Very fine. Mulege Bay. 
Bezoardica abbreviata. Mulege Bay. 
Ficula decussata. Angeles Bay. 
Pyrula patula. Agiobampo Bay. 
Malea ringens. Lobos Island. 
Argonauta hians. 1 fine sp. Upper part of Gulf of California. 
To the Guaymas fauna must be added, from Dr. Gould’s portion of the 
same collection, ‘‘ Pecten pyaidatus” [?=subcrenatus, jun.). Also from the 
collection of the Calif. Ac. Nat. Sc., Wassa nodocincta, A. ‘Ad. [Galapagos; 
Cuming]. On comparing these lists with the shells given in B. A. Rep. 
p- 352 (in which the Venus quoted is not “ stamnea, Conr.,” but a southern 
species), it will be seen that the fauna of the upper part of the Gulf, as far 
north as it has been explored, is essentially tropical. The Chione fluctifraga 
