43 



486 Clathurella affinis Dall. 



San Miguel Island to Cape San Lucas. 

 Cal. ac pr 5:62. 



487 Drillia torosa Carpenter. 

 Monterey to San Diego. 



488 Variety Nitens Carpenter. 

 Santa Rosa Island (Yates). 



489 Bivonia compacta Carpenter. 

 Washington; San Pedro, Cal. 



490 Phasianella compta pulloides Carpenter. 

 Synonym of Phasianella pulloides. 



491 Crepidula excavata Brod. 

 Sitka; Mexico; Peru. 



492 C. navicelloides nummaria Gould. 

 Synonym of Crepidula Lessoni nummaria. 



493 C navicelloides explanata Gould. 

 Synonym of Crepidula Lessoni explanata. 



o 



494 Dall, William Healey: 



On some new or interesting West American shells obtained 

 from the dredgings of the U. S. fish commission steamer Albatross 

 in 1888, and from other sources. U. S. nat. mus. pr 14:173-191 

 t 5-7. 



Contains notes or descriptions of the following forms, num- 

 bered 495-532. 



495 Eupleura muriciformis Broderip. 



Synonymy quoted: — Ranella muriciformis Broderip; R. pli- 

 cata and triquetre Reeve. 



Cerros Island; San Diego; Venezuelan coast of the Pacific. 



496 Variety? Unispinosa Dall. Mazatlan. 



497 Variety Limata Dall. Gulf of Cal. 



498 Eupleura caudata Say. 

 Cape Cod to the Florida keys. 



499 Variety sulcidentata Dall. Florida. 



500 Nassa californiana 



"Generally ventricose; cancellate; slightly tabulate on the 

 upper portion of the whorls near the suture; where the revolving 

 ribs cross the longitudinal ribs there occurs a considerable nodule; 

 body whorl with about ten prominent revolving ribs and with 

 about three less conspicuous at the base; the basal channel ceases 

 just before reaching the columella; columella smooth without 

 teeth or tubercles; outer lip strongly sinuate with the extreme 

 edge crenate. Whorls of the spire about five. Ground color 

 white; revolving ribs purplish brown; epidermis yellowish white; 

 varieties occur with omission of color in some or the revolving 

 ribs which gives a faint pattern of banding. Length 30 mm; 

 width 11 mm; spire 10 mm." — J. J. Rivers, Zoe 2:70-82, f. 



