West American Mollusca. 223 



MiTRA (?C0STELLARIA) NODOCANCELLATA SteaniS, 1. C. 213, pi. 



XV. fig. 14. Gulf of California. 



Venekicardia barbarexsis Stearns, 1. c. 214, pi. xvi. figs. 3, 4. 

 Off Santa Barbara islands, California, in green mud at 276 fathoms 

 depth. 



Venekicardia borealis Conrad, Am. Con., 39 (with fig.); 

 Stearns, 1. c. 215, pi. xvi. fig. 8; Gould, Inv. Mass.; Arcturus rudis 

 Humphrey MS.; Cardita vestita Deshayes. Circumpolar. 



Venericardia ventricosa Gould. Steams, 1. c. 216, pi. xvi. 

 figs. 5. 6. Puget Sound. 



MiODON PROLONGATUS Cpr., Aiinals and Magazine of Natural 

 History, 3d ser., xiv. 424; Steams, 1. c. 217, pi. xvi. figs, 7, 9. 

 Neeah baj', and Middleton island. 



LuciNA ^QUizoNATA Steams, I.e. 220, pi. xvii. fig. 34. Oft' Santa 

 Barbara islands, California, in green mud at 276 fathoms depth. 



Venus (Chione) effeminati Steams, 1. c. 221, pi. xvii. figs. 1, 2. 

 Panama ba3\ 



Periploma discus Stearns, 1. c. 222, pi. xvi. figs. 1, 2. San 

 Pedro, Long Beach and vicinity, Los Angeles county, California. 



Periploma argentaria Conrad, Jour. Phila. Acad. Nat. Sci- 

 ences, vii. pt. II (1837), 238, pi. IS, fig. 8; Stearns, 1. c. 223, 224. 

 Dr. Steams treats this as synon^^mous with P. plaiuscula Sby. 



Periploma planiuscula Sby., Proc. Zool. Soc. London, 1834, 

 p. 87; P. argentaria Conr., 1. c; P. alta C. B. Adams; P. Centicu- 

 laris Sb3'.; P. excurva Cpr.; P. excurvata Cpr., British Ass. report, 

 1856, p. 287. Synonymy as given by Stearns, 1. c. 224. Pacific 

 coast south of Point Conception. 



? Periploma papyracea Cpr., Proc. Zool. soc. London, 1856, p. 

 229. Steams (1. c. 224), mentions this as a West American species 

 belonging to Carpenter's Mexican and Panaraic province. 



Helix (Arionta) carpenteri Newc. variety indioensis L. G. 

 Yates, Nautilus, iv. 63 (also p. 51); Orcutt, Nautilus, iv. 67. Indio, 

 San Diego count}^ California, in the Colorado desert region. Dr. 

 Yates bases this variety on specimens collected by Dr. Stephen 

 Bowers. Specimens collected in the same vicinity by the writer I 

 have referred (Orcutt, 1. c.) to H. Traskii, of which I consider it to 

 be a well marked variety. Dr. Steams (1. c. 206) refers to H. car- 

 penteri as a s\-nonym of H. remondi, so that Dr. Yates' variety will 

 have to be referred to that, or a related species. 



Haliotis rufescens Swains. Hemphill, Nautilus, iv. 59; Or- 

 cutt, 1. c. 67. The geographical range is quoted as from Mendocino 

 countj^ to San Nicholas island, California, and Santo Tomas land- 

 ing, Lower California. 



