ARNOLD — THE PALEONTOLOGY AND STKATIGKAPHY OF SAN PEDUO. 231 



2i8. Nassa californiana Conrad. 



Plate IV, Fig. 3. 



Schizopyga calif orjiiana Con., Proc. Phil. Acad. Nat. Sci., 1856, p. 315; Pac. R. R. Rept., Vol. VI 



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

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

 Nassa californiana Con., Dall, Proc. U. S. Nat. Mus., Vol. XIV, 1891, p. 177. Cooper, Bull. 



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

 Nassa fossata van, Gabb, 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.; defl 

 48 degrees. 



The most beautiful and one of the hirgest of the Pleistocene Nassau. Easily- 

 distinguishable by the ornamentation and size. 



Rare in the upper San Pedro series, except at one place in the bluf! just 

 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 upper 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. 



Pl.\te IV, Fig. 1. 



Shell small, conical; spire elevated; apex 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.; defl. 

 30 degrees. 



This species varies ranch, especially in deflection and in tlie number of trans- 

 verse ridges. The deflection of the upper whorls is sometimes as high as 60 degrees, 



