ARNOLD — THE PALEONTOLOGY AND STRATIGRAPHY OF SAN PEDRO. 239 



ftl)iral linos on the lower i)iU't of thu budy-wlioil, iloes not have the ovcrlaii[»ing 

 apiieanuuH' of the whorls at the suture as much as in A.f/nunapata, has a less heavy 

 shell, and has a less glossy surface. Specimen identified by Dr. J)all. 



Rare in the lower San Pedro series at Deadraan Island, also found in tlie 

 lower San Pedro series at San Pedro. The specimen figured is from the lower Sun 

 Pedro series at Deadman Island, and is now in the collection of Deles Arnold. 



Living. — Santa Barbara to San Diego (Carpenter). 



} Pleistocene. — San Pedro (Oldroyd; Arnold). 



232. Columbella (Astyris) gausapata Gould. 



Pi.ATK X, Fig. 8. 



Columbella gausapata Gld., Proc. Bost. Soc. Nat. Hist., 1850, p. 170; Wilkes' Exp). E.xped., 



Vol. XII, p. 267, Pi. XIX, fig. 337, 1852. 

 Nassa pcdroana Con., Pac. R. R. Re])t.. Vol. V, p. 327, PI. VI, fig. 48, 1856. 

 Amycla gausapata Gld., Cpk., Brit. Assn. Rept., 1863, p. 662. Gabb, Pal. Cal., Vol. II, p. 76, 1869. 



Cooper, 7th Ann. Rept. Cal. St. Min., 1888, p. 229. 

 Astyris gausapata Gld., Keep, West Coast Shells, p. 35, fig. 15, 1892. 

 Colutnbclla {Astyris) gausapata Gld., Willl\mson, Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 213. 



Shell small, rather heavy; spire elevated; ape.x acute; whorls seven, slightly convex; body- 

 whorl ventricose, slightly angulated; whorls smooth except for delicate incremental lines; suture 

 depressed, distinct; columella recurved and striated on outside with faint spiral ridges and grooves; 

 aperture elongate-ovate; canal prominent, slightly curved; outer lip thickened with a row of spirally 

 elongate denticles; inner lip smooth. 



Dimensions. — Long. 11 mm.;lat. 5 mm.; body-whorl 7 mm.; aperture (not including 

 canal) 3 mm-X i-9 mm.; defl. 35 degrees. 



Distinguishable from C. cnliforniann by much longer canal, thicker shell, and 

 more prominent denticulation of outer lip; distinguishable from C. iuberosa by 

 broader spire and less angulated body-whorl; distinguishable from \Rr. carinata hy 

 lack of keel, and slenderer spire. Specimens Identified by Dr. Dall. 



Found in all of the formations at all of the localities in the vicinity of San 

 Pedro. Pound also in the Pleistocene at the bath-house, Santa Barbara; at Barlow's 

 ranch and the old irrigating ditch, Ventura; and at Twenty-sixth Street and Pacific 

 Beach, San Diego. Much rarer than var. carinata. The specimen figured is from 

 the upper San Pedro series at San Pedro, and is now in the collection of Delos 

 Arnold. 



Living. — Alaska to San Diego (Cooper). 



Pleistocene. — Santa Barbara to San Diego (Cooper): San Pedro; Ventura; 

 Santa Barbara; San Diego (Arnold). 



Pliocene. — Kirker's Pass (Cooper). 



