AKNOLD — TUE I'ALEONTOLOCi V AND STRATIGKAl'UV Ul' SAN I'KDKO. 231 



2i8. Nassa calif orniana Conrad. 



Plate IV, Fi<;. 3. 



Schizopyga califomiana CoN., Proc. Phil. Acad. Nat. Sci., 1S56, p. 315; Pac. R. R. Rept., Vol. VI 



p. 69, PI. II, fig. I, 1857. 

 Schizopyga californica CoN., Tryon, Man. Conch., Vol. IV, p. 55, PI. Ill, fig. 32, 1882. 

 Nassa cali/orniana Con., Dall, Proc. U. S. Nat. Mus., Vol. XIV, iSgi, p. 177. Cooper, Bull. 



No. 9, Cal. St. Min. Bureau, Part 3, 1894, p. 29. 

 Nassa fossata van, Gahb, Pal. Cal., Vol. II, pp. 47, 74, 1869. 



Shell large, conical; whorls seven, convex, ornamented with about thirteen prominent, 

 rounded, posteriorly sloping, transverse ribs and four or five slightly less prominent sharp, revolving 

 ridges; the transverse ridges tend to become less prominent on the anterior part of the body-whorl; 

 suture deeply impressed, distinct; aperture subovate; outer lip thin and denticulated by ends of 

 internal revolving ridges; inner lip slightly incrusted; columella short, twisted, spirally and longitudi- 

 nally ornamented, and deeply grooved next to body-whorl; anterior sinus very short, broad, recurved. 



Dimensions. — Long. 37 mm.; lat. 20.5 mm.; body-whorl 24 mm.; aperture 16.5 mm.; dell 

 48 degrees. 



The most heautil'iil and one of the largest of the Pleistocene Nassas. Easily 

 tlistinguisluible by the ornamentation and size. 



Rare in the upper San Pedro series, except at one place in the bluff ju.st 

 north of the town of San Pedro, where quite a few very fine specimens have been 

 found; also found in the Pliocene and lower San Pedro series at Deadman Island; 

 and in the uiipor San Pedro series at Los Cerritos, Deadman Island, and Long Beach. 

 Found also in the Pleistocene at Barlow's ranch, Ventura; and at Pacific Beach, 

 San Diego. The specimen figured is from the upper San Pedro series of San Pedro; 

 and is now in the private collection of Delos Arnold. 



Living. — Drake's Bay to Cedros Island, Lower California (Cooper). 



Pleistocene. — San Pedro; Ventura; San Diego (Arnold). 



Pliocene. — San Pedro (Arnold), 



Miocene.- — Santa Clara County (Cooper). 



219. Nassa cerritensis, sp. nov. 



Plate IV, Fig. 1. 



Shell small, conical; spire elevated; ape.x subacute; whorls eight, slightly convex, crossed 

 by seven to ten prominent, rounded ridges which are less prominent near the suture; spiral sculp- 

 ture consists of nine to eleven sharp, raised lines; three upper whorls have a cancellate appearance; 

 suture appressed, wavy; aperture ovate; outer lip thickened by denticulated ridge on inner side; 

 inner lip smooth, incrusted, the incrustation completely covering the spiral sculpture internally; 

 columella twisted, spirally sculptured, with deep groove next to body- whorl; canal short, broad, 

 recurved. 



Dimensions. — Long. 30 mm.; lat. 14.5 mm.; body-whorl 18 mm.; aperture 11 mm.; dell. 

 30 degrees. 



This species varies much, especially in deflection and in the number of trans- 

 verse ridges. The deflection of the upper whorls is sometimes as high as GO degrees. 



