286 CALIFOKNIA ACADEMY OF SCIKNCKS. 



306. Tritonium gibbosus liroderip. 



Tn'ion gibbosus Brod., Proc. Zool. Soc, 1833, p. 7, PI. VII. Kuster, Concli. Cab., p. 69, fig. 7. 

 Tryon, Man. Conch., Vol. Ill, p. 23, PI. XII, fig, 103, iSSi. Cooper, Bull. No. 4, 

 Cal. St. Min. Hurcau, Part III, 1894, p. 32. 



Shell small, subfusiform; whorls five, subtriaiigiilar, strongly angulated, giving tabular 

 appearance to the iii>per part of whorls; prominent rounded, nodose varices at about every two- 

 thirds of a revolution, with two orthree nodes on angle of whorl in intervening spaces; suture reaching 

 nearly to columella, giving a staircase appearance to the spire; surface ornamented with small, 

 revolving ridges matle rugose by incremental lines; aperture subcircuhir; outer li|) slightly corru- 

 gated internally; inner lip smooth, incrusted; canal long, narrow, curved slightly back; umbilicus 

 subperforate. 



Dimnisions. — Long. 41 mm.; lat. 22 mm.; body-whorl 2S mm.; aperture 10 mm.; canal 

 II mm.; defi. 56 degrees. 



A uiiifjnc .shell, the only one of its genus ko i'ar recorded as occiiiiiig I'ossil in 

 California. 



Rare in upper San Pedro series of San Pedro; one specimen found. Dr. 

 Dall also reports one found in the hay at this place, which he thinks is a fo.ssil that 

 had been weathered out of the Pleistocene beds. 



Living. — West tropical America; Panama (Cooper). 



Pleistocene. — San Pedro (Dall; Arnold). 



Subgenus Priene //. (("■ A. Adams. 



Shell ventricose, thin, cancellated or plicated ; canal short ; operculum with apical 

 initial point. 



307. Tritonium (Priene) oregonensis Redjidd. 



Pi.ATK VI, Fk;. 1. 



Triton oregonense K^DF.. Ann. N. Y. Lye, Vol. IV, 1846, p. 165, PI. XI, figs. 2a, 2b. Gi.D., 



Wilkes' E.xpl. E.xped., Vol. XII, p. 241, 1852. 

 Fusus oregotiefisis Redf., Reeve, Icon. Conch., No. 61, figs. 6ia-6, 1848. 

 Triton (Priene) oregonensis Redf., Cpr., Brit. Assn. Rept., 1863, p. 661. 

 Tritoninm (Priene) oregonensis Redf., Gabb, Pal. Cal. Vol. II, p. 73, 1869. 

 Tritoninm oregonense Redf., Dall, Proc. U. S. Nat. Mus., Vol. IX, 1887, p. 212. 

 Priene oregonensis Redf., Cooper, 7th Ann. Rept. Cal. St. Min., 1888, p. 261. Keep, West Coast 



Shells, p. 44, 1892. 

 Priene cancellatiis Lam. {fide Trvon, Man. Clonch., Vol. Ill, ]>. 34, PI. XVI, figs. 164-167; 

 PI. XVII, figs. 170-172, 1881) (pars). 



Shell large, fusiform; spire elevated; apex blunt; whorls eight to ten, convex; nuclear 

 whorls smooth, except for obsolete spiral striations; cancellated sculpture of nearly equally promi- 

 nent spiral and transverse rounded ridges; suture deeply impressed; discontinuous rounded varices 

 at every half to two-thirds revolution on upper whorls; aperture subovate; outer lip not thickened, 

 slightly effuse on adult shells; canal long, narrow, recurved; inner lip incrusted; columella slightly 

 twisted; umbilicus obsolete. 



Dimensions. — Long. 103 mm.; lat. 48.5 mm.; body-whorl 71 mm.; aperture 31 mm.; canal 

 21 mm.; defl. 47 degrees. 



