70 



whorls cancellated; body whorl traversed by about 14 roughly- 

 rounded revolving costae, more or less tuberculated at the inter- 

 section of the longitudinal ribs, and marked with fine incremental 

 striae. Last whorl % the length of the shell; outer lip thickened 

 internally denticulate, external edge crenulated. Columella ex- 

 cavated, light purple or purplish brown; canal short, open or 

 closed in specimens of equal size. Umbilicus obsolete; surface of 

 whorls with faint irregular longitudinal costae. Color dingy white, 

 with 2 interrupted black or dark brown bands. Lon. .85; lat. .5 

 in. Habitat — Monterey, California; Hemphill, Harford, Gordon, 

 and Stearns, 16 specimens, mostly immature." — Robert E. C. 

 Stearns, Conchological memoranda No. 6 (May 18, 1871); "Am 

 J Conch 7: — (1871), with f." 



"Not rare under stones at Portuguese Bend," near San Pedro, 

 Cal., fide Mrs. Williamson (U S Na mu pr 15:21b;. 



946 Odostomia intlata Carpenter. 

 Vancouver Island to Monterey, Cal. 



947 Odostomia nuciformis Carpenter. 

 Vancouver Island and Straits of Fuca. 

 Type locality: — Neeah bay, Wash. 



948 Odostomia satura Carpenter. 

 Straits of Fuca to Monterey, Cal. 



Type locality: — Neeah bay, Wash. (J. G. Swan). 



949 Odostomia sitkensis Dall. 

 Sitka to Vancouver Island. 



950 Odostomia straminea Carpenter. 

 Monterey to Lower California. 



951 Odostomia tenuisculpta Carpenter. 

 Straits of Fuca, Washington. Monterey, Cal. 



952 Ommastrephes giganteus Orbigny. See 2247. 

 Monterey bay, California, to South America. 



953 Ommastrephes sagittatus Lamarck. 



Nearctic?- — south to New York and Vancouver Island. 



954 Ommastrephes tryoni Gabb. 

 Coast of California. 



955 Ommastrephes robustus Dall. 

 Alaska. 



956 Onchidella borealis Dall. 

 Sitka, Alaska, to Straits of Fuca. 

 Taylor, Nautilus 5:92. 



957 Onchidella carpenteri W. G. Binney. 

 Straits of Fuca? to Gulf of California. 



958 Opalia borealis Gould. 

 Straits of Fuca to San Diego. 



959 Opalia retiporosa Carpenter. 



San Pedro and Catalina Island, California. 

 Synonym of Scala retiporosa. 



960 Opalia spongiosa Carpenter. 

 Monterey, California. 



961 Ostrea amara Carpenter. 



San Diego, California?, to Panama. 



962 Oscilla insculpta Carpenter. 

 Southern California. 



963 Ovulum barbarense Dall. 

 Santa Barbara to San Pedro, Cal. 



964 Ovulum formicarium Sowerby. 

 Southern California (to South America?). 



965 Paludinella newcombiana Hemphill. 

 Humboldt bay, Cal. 



