ARNOLD — THE PALEONTOLOGY AND STRATIGRAPHY OF SAN PEDKO. 239 



spiral lines on the lower part of the body-whorl, does not have the overlapping 

 appearance of the whorls at the suture as ranch as in A.c/ausapatn, has a less heavy 

 shell, and has a less glossy surface. Specimen identified by Dr. Dall. 



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

 lower San Pedro series at San Pedro. Tiie specimen figured is from the lower San 

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



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



Pleistocene. — San Pedro (Oldroyd; Arnold). 



232. Columbella (Astyris) gausapata Gould. 



Plate X, Fig. 8. 



Columbella gausapata Gld., Proc. Bost. Soc. Nat. Hist., 1850, p. 170; Wilkes' Expl. Exped., 



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

 Nassa pedroana Con., Pac. R. R. Rept.. 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. 

 Columbella (Astyris) gausapata Gld., Williamson, Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 213. 



Shell small, rather heavy; spire elevated; apex 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 nim.X i-9 mm.; defl. 35 degrees. 



Distinguishable from C calif orniana by much longer canal, thicker shell, and 

 more jirominent denticulation of outer lip; distinguishable from C. tuhero^a by 

 broader spire and less angulated body-whorl; distinguishable from var. carinata by 

 lack of keel, and slenderer spire. Specimens identified by Di-. Dall. 



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

 Pedro. Found 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). 



