254 CALIFOENIA ACADEMY OF SCIENt'ES. 



257. Trophon (Boreotrophon) triangulatus Cmjienter. 



Trophon Iriangtilatus QvK., Brit. Assn. Rept., 1863, p. 663; Proc. Cal. Acad. Sci., Vol. Ill, 1865, 

 p. 224. Tryon, Man. Conch., Vol. II, p 42, 1880. Cooper, 7th Ann. Rept. Cal. St. 

 Min., 1888, p. 268. 

 Trophon (Boreotrophon) Irian^tilatus Cpr., Dall, Proc. U. S. Nat. Mus., Vol. XIV, 1891, p. 180, 

 PI. V, figs. I, 3 and 6; Vol. XV, 1892, p. 216. 



"Whorls about seven, the nuclear lost; varices six to the whorl, strong, wide, thin edged, 

 with guttered spines which have their hinder edge rounded; surface with strongly marked lines of 

 growth and half obsolete, fine, irregular, spiral scratches, strongest on the body and almost wholly 

 wanting between the suture and the spines; the aperture in some specimens might be denticulate. 



'''Dimensions. — Long. 75 mm.; lat. 50 mm.; apenure 56 mm." 



As the only shell found in the Pleistocene was an extremely young and worn 

 specimen, the above, taken from a description by Dr. Dall (Proc. U. S. Nat. Mns., 

 Vol. XIV, p. 180), is inserted. The Pleistocene specimen measures 9 mm. in 

 length, and has nine varices. The young of this species is distinguishable from the 

 young of T. gracilis by having a shorter canal and less prominent varices. 



Rare in lower San Pedro .series of Deadman Island. 



Living. — Santa Cruz Island to Catalina; Lower California (Cooper): San 

 Pedro (Williamson). 



Pkii^tocene. — Santa Barbara (Coopei-): San Pedro (Ai'uold). 



Genus Ocinebra Leach. 



Sliell small, with numerous varices which are foliated ;ind often spinose; spiral sculpture; 

 canal more or less closed. 



Ocinebra erinaceus Linn, is a characteristic species. 

 258. Ocinebra barbarensis G<(hb. 



Plate V, Fir:. 1. 



Murex barbarensis Gabb, Proc. Cal. Acad. Sci., Vol. III. 1865, p. 183. 



Muricidea barbarejisis Gabb, Pal. Cal, \'ol. II, p. 69. 1S69 



Ocinebra barbarensis Gabb, Tryon, Man. Conch., \'ol. II, p. 124, 1880. 



Shell small, fusiform; spire elevated, subacute; whorls four or five, sharply angulated, flat 

 or concave above, slightly convex below, ornamented with five to nine rather sharp, transverse 

 ridges, which rise to a sharp, recurved process on angle, and by numerous strong squamose, revolv- 

 ing ridges; suture very deeply appressed, giving spire a staircase appearance; aperture subelliptical; 

 outer lip thickened, denticulated; inner lip incrusted, projecting slightly; canal short, narrow, gener- 

 ally covered; columella slightly widened and twisted. 



Dimensions. — Long. 19mm.; lat. 10 mm.; body-wliorl 15 mm.; apertun-, incUuiing canal, 

 II mm.; canal 5 mm.; defl. 60 degrees. 



Distinguishable from O.peritn by more prominent ])roce.sses on angle of whorl, 

 more prominent spiral ridges, deeper appressed suture, and more tabulated upper 

 portion of whorl. Specimens identified by Dr. Dall. 



