1894. PBOCEEDIXGS OF THE NJTWXAL MUSEUM. 147 



Sau Qiieiitin Bay, Beldiug; San -Tuanico, Gabb; Guaymaa (No. 23616, 



U.S. N. M.), Dr. Palmer. 



ARC A (NOETIA) GKANDIS. Hio.lerip ami Sower by. 



A few examples. Guaymas (No. 23616, U. S. N. M.), Dr. Palmer; San 

 Juaiiico. 



ARCA (BYSSOARCA) GRADATA, Broderip and Sowerl.y. 



Abundant. Point Escondido; St. Josef Island; La Pa/. Ranges 

 southerly to Ecuador. 



ARCA (BYSSOARCA) SOLIDA, Sower by. 



Common. Point Escondido (No. 7o()12, U. S. N. M.); St. Josef 

 Island; La Paz; found nearly everywhere in the Gulf, and in South 

 America on the coast of Peru. The Albatross collection contained one 

 valve from Sta. Margarita Island. 



ARCA (BYSSOARCA) REEVIANA, Orbij-ny. 



Several specimens. Mulege Bay (No. 74825, U. S. N. M.); La Paz 

 (No. 34100, U. S. N. M.), Belding; San Ignacio Lagoon (No. 105612, U. 

 S.N. M.), H. Hemphill, "underside of stones." 



ARCA (BYSSOARCA) MUTABILIS, S()werl)y. 



One living example. Tres Marias (No. 102184, U. S. N. M.). 



PECTUNCULUS ( AXIN.EA) MACIJLATA, li r o d «■ rip. 

 Three examples. La Paz (No. 63782, U. S. N. M.), S. I*illsbnry. 



PECTUNCULUS (AXIN^A) TENUISCULPTUS, Carpenter. 



Several specimens. Carmen Island (No. 63776, U. S. N. M.), Towne. 



PECTUNCULUS (AXIN.EA) GIGANTEUS, Reeve. 



Numerous examples. La Paz and San Josef Island; Guaymas (No. 

 23547, U. S. N. M.), Palmer; Carmen Island (No. 63777, U. S. N. M.), 

 Towne. An adolescent example at the first named locality was col- 

 lected by Capt. Eorrer (No. 63781, U. S. N. M.), and Fisher's, from 

 St. Josef Island, were all young shells. Towne's Carmen Island speci- 

 mens were very fine. 



Family Led 10.^3. 



LEDA (YOLDIA) LANCEOLATA, Lamarck. 

 Numerous valves. Gulf of California (No. 73667, U. S. N. M.). 



