140 THE NAUTILUS. 



crispata Desli.), G. rigida Dilhv. 1817 ( F. rugosa Gmel. 1772, not 

 Linn. 1771), C. rugcOina Heilp. and C strigillina Dall. Cyclinella 

 tenuis Reel. (Luciuopsis tenuis); Chione canceUata L. ( Venus cancel- 

 latd), G. suhrostrata Lam. (^V- beaui Reel.). G. mazyckii Dall; G. 

 intapurpurea Con.; G. gviis Holmes ; G. pygmaea Lam.; G. paphia 

 L.; G. latiiirata Conr. {^V. varicosd Sowb.); Anomalocardiahrasiliana 

 Gmel. (^Vemis jiexuosa Born, not Linn., and V- macrodon Hanley are 

 syn.) A. cuneimeris Con. (]^. rostrata Sowb.); Venus mercenaria L.; 

 V- campechievsis Gmel. ( F. mortoni Con.), Liocyma jiucltiosa Gould ; 

 Gemma gemma Tott.; G. purpurea H. C. Lea {G. concentrica Dall.), 

 and Parastarte triquetra Con. 



From the Paeifie eoast north of Mexieo the following are reeeived : 

 Dosinia ponder osa Gray (Pleistoeene only, on the California coast), 

 Transennella tontilla Gld.; Tirela (Pac/iydesma) stuhoruin Mawe. 

 (more familiarly known as Pachydesma crassatelloides Conr.), 

 Amiantis caUosa Con.; Pitaria neivcombiana. Gabb.; Cytherea fordi 

 Yates ; Saxidomns nuttallii Conr.; S. gigantea Desh.; Ghione jlucti- 

 fraga Sowb.; G. undateUa Sowb. {V- simiUima Sowb.); G. succincta 

 Val.; Venus kennicottii Dall ; Marcia kenneileyi Rve.; M. subdiaphana 

 Cpr.; Paphia (^Protothaca) staminea Conr. The genus Paphia 

 Bolton 1798, replaces Tapes Megerie 1811, the latter is however 

 used as a sub-genus. Five varieties of P. staminea. are recognized 

 Petiti Desh. (rigida Gould); laciniata Cpr.; ruderata Desh.; orbella 

 Cpr., and sulcidosa Dall. P. tenerrima Cpr.; Liocyma beckii Dall ; 

 L. viridis Dall ; L. scammoni Dall ; Venerupis lamellifera, Psephidia 

 lordi Baird {Psephis lordi~), P. oralis Dall, and Gemma gemma Ton., 

 the latter introduced into San Francisco Bay on " seed" oysters, 



A number of forms on the Pacific coast are closely related to 

 species of the Atlantic faui-a, and probably had a common ancestry 

 when the two oceans were connected at tl'e isthmus. Dosinia 

 y?on</er«sa " recalls somewhat tlic Atlantic D. rontentrica ; ^' Tiveln 

 byronensis Gray (7". radiata Sowb.), is " the analogue of T. mac- 

 troides Born of the Antilles ;" 3Iacroca1list(t squallida Sowb., is the 

 analogue of M. macuhita of tiie Atlantic fauna, and GaUocardta 

 catharia Dall, is represented in West Indies by G. aresfa Dall and 

 Simpson ; Pitaria tomeana Dall is " the apparent analogue of P. 

 fulminata of the Atlantic fauna." P. {Hysteroconclai) lupanaria 

 Less, is " a larger but less elegant analogue of the Aiilillean P. dione 

 L., easily recognized by the violet spots at the base of the spines ; " 



