23S lALU'UliNIA A(.:.V1j1;MV OF SCIENCES. 



aperture ovate; canal short; outer lip thickened by several longitudinally elongate denticles on inner 

 side; inner lip curveil, smooth; spiral ornamentation prominent on lower portion of columella. 



Dimensions. — Long. S.2 mm.; hit. 3 mm.; body-whorl 5.5 mm.; aperture 3.4 mm.; defl. 

 44 degrees. 



Rare in tlie lower San Pedro series at Deatlman Island ami San Pedro; not 

 uncommon in the upper San Pedro series at San Pedro. Found also in the Pleisto- 

 cene at Twenty-sixth street, San Diego. The specimen fissured is from the upper 

 San Pedro series at San Pedro, and is now in the colleetion of Delos Arnold. 



Living. — San Pedro to San Diego (Cooper). 



Pkislocene. — San Pedro; San Diego (Arnold). 



230. Columbella (jEsopus) oldroydi, s^). iiov. 



Platk VI, Fit;. 7. 



Shell small, slender, fusiform; spire elevated; apex rounded; whorls seven, convex; first 

 three whorls smooth, remainder, with exception of body-whorl, ornamented with about eighteen 

 transverse ridges and two or three rather indistinct spiral grooves, the whole giving a cancellate 

 appearance to the surface; on the body-whorl the transverse and spiral sculpture are of about ecjual 

 prominence, the transverse sculpture being more subdued than on the whorls above it; suture quite 

 deeply impressed; aperture narrow, elliptical; pillar truncated anteriorly; outer lip smooth, thin; 

 inner lip smooth. 



Dimensions. — Long. 9 mm.; lat. 2.6 mm.; body-whorl 5 mm.; ai)erture 3 mm.; defl. 

 24 degrees. 



Distinguishable from ^1. chrijsalloide.a by slenderer form, prominently sculp- 

 tured surface, deeper suture, and smooth inner lip. Pronounced a new species by 

 Dr. Dall. 



Lower San Pedro series at Deadraan Island; rare. The specimen figured is 

 the type, and is now in the collection of Mrs. Oldroyd. 



Pleistocene. — San Pedro (Arnold). 



Subgenus Astyris //. <t- A. Adams. 



Shell oval-fusiform, smooth or transversely striated; aperture oval; inner lip smooth, not 

 callous; outer lip sinuous posteriorly, crenulated within. 



Astyris clausiliceforme Kiener is a characteristic species. 



231. Columbella (Astyris) californiana Gaskoin. 



Platk X, Fig. 9. 



Columbella (^Aslyris) californiana G ASK. , Proc. Zool. Soc, 1851, p. 12. 

 Columbella californiana Gask., Cpr., Brit. Assn. Rept. , 1856, p. 341. 



This species resembles A. gausajnita quite closely, but differs from it in the 

 following respects: it is slightly broader, has more swelling whorls, more prominent 



