148 



2135 Dosinia (Dosinidia) Dunkeri Philippi. 1844. 

 Magdalena bay, Baja Cal. — Head of Gulf of Cal. — Santa 



Elena, Colombia. 



2136 Dosinia (Dosinidia) Annae Cpr. 18 57. 

 Gulf of Cal. — Mazatlan, Sin. 



2137 dementia solida Dall. 1902. 

 Topolobampo, Sin., Mexico. 



2138 Transennella tantilla Gould. 1853. 



Sitka, Alaska. — Todos Santos bay, Lower Cal. 

 Pleistocene of Santa Barbara, Cal. 



2139 Tivela planulata Sby. 1829. 

 Gulf of Cal. — Ecuador. 



2140 Tivella hians Phil. 1851. 

 Magdalena bay, Baja Cal. — Valparaiso, Chili. 



2141 Tivela arguta Roemer. 1864. 

 Gulf of Cal. — Panama. 



2142 Tivela Byronensis Gray. 1838. 

 Scammon's Lagoon, Lower Cal. — Ecuador. 



2143 Tivela Delesserti Deshayes. 1854. 

 Scammon's Lagoon, Baja Cal. — Acapulco, Mexico. 



2144 Tivela stultorum Mawe. 



Synonymy: — Pachydesma crassatelloides, etc. 



2145 Macrocallista squalida Sowerby. 183 5. 

 Cerros Island, Baja Cal. — Peru. 



2146 Macrocallista aurantiaea Sby. 1831. 

 Gulf of Cal. — Peru. 



2147 Macrocallista pannosa Sby. 1835. 

 Gulf of Cal.- — Valparaiso, Chile. 



2148 Macrocallista puella Cpr. 1864. 

 Gulf of Cal. to Acapulco, Mexico. 



2149 Callocardia (Agriopoma) Catharia Dall. 1902. 

 Ballenas bay, Baja Cal. — Gulf of Cal. — Panama. 



2150 Pitaria Newcombiana Gabb. 1865. 



Monterey, Cal., to Clarion Island, and the Gulf of Cal., in 15- 

 31 fms. 



Thin and delicate, with zigzag brown markings and a papery 

 periostracum when fresh. 



2151 Pitaria unicolor Sby. 1835. 

 Humboldt bay, Cal. — Panama. 



2153 Pitaria vulnerata Brod. 1835. 

 Magdalena bay, Lower Cal. — Panama. 



2154 Pitaria lupanaria Lesson. 1832. 

 Ballenas bay, Baja Cal. — Payta, Peru. 



2155 Pitaria rosea Brod. & Sby. 1829. 

 Gulf of Cal. to Panama. 



2156 P: (Lamelliconcha) concinna Sby. 1835. 

 Magdalena bay, Lower Cal. — Ecuador. — -Peru. 



2157 P: circinata alternata Brod. 183 5. 



2158 Cytherea (Ventricola) Fordi 

 Santa Barbara Islands, Cal. — Panama. 



See description under Venus Fordi; Dall says it is quite dis- 

 tinct from Venus toreuma of the Polynesian Islands. 



2159 Cytherea (Ventricola) Magdalena* Dall. 1902. 



Off Magdalena bay, Baja Cal. — Panama bay, in 18 fms. 



2160 Cytherea (Ventricola) rigida Dillwyn. 1817. 

 Gulf of Cal. — West Indies. 



Synonymy: — Venus isocardia Verrill (1870); not V. rigida 

 Gld. 1850. 



2161 Cytherea multicostata Sby. 1835. 



Gulf of Cal. — Panama. — Galapagos Islands. 



