254 CALIFOUNIA ACADEMY OF SCIENCES. 



257. Trophon (Boreotrophon) triangulatus Citrpenter. 



Trop/ion /rnt//g7(/a///s Cfr., Brit. Assn. Rept., 1863, p. 663; Proc. Cal. Acad. Sci., Vol. Ill, 1865, 

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

 Min., 1888, p. 268. 



Trophon ( Doreoirophmi) Iriangii/atiis Cpr., Dall, Proc. U. S. Nat. Mus., V^ol. 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. 



"Dimens707is. — Long. 75 mm.; lat. 50 mm.; aperiure 56 mm." 



As the only shell foiiiul in the Pleistocene was an extremely yonng and worn 

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

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

 length, and has nine varices. The yonng of this species is distinguishable fi'om the 

 young of T. grafi/is 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). 



Pleistocene. — Santa Baibara (Coopei'): Sail J-'edru (Ainuld). 



Genus Ocinebra Leach. 



Shell small, \\ ith numerous varices which are foliated and often s]iinose; spiral sculpture; 

 canal more or less closed. 



Ocinebra erinaceus Linn, is a characteristic species. 

 258. Ocinebra barbarensis Uabb. 



Plate V, Fio. 1. 



Murex baibarcmis, Gabb, Proc. Cal. Acad. Sci., Vol. Ill, 1865, p. 183. 



Muricidea barbarensis Gabb, Pal. Cal., Vol. II, p. 69. 1869. 



Ocinebra barbarensis Gabb, Trvon, Man. Conch., Vol. 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-whorl 15 mm.; aperture, inckuiing canal, 

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



Distinguishable from O.perita by more prominent processes on angle of whorl, 

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

 portion of whorl. Specimens identified by Dr. Dall. 



