2,")4 ( ALIKilUNIA AlADKMV Ol" SCIKNCKS. 



257. Trophon (Boreotrophon) triangulatus Curpenter. 



Tioplwn Iriiingulaliis Ci'R., Brit Assn. Kept., 1S63, p. 663; Proc. Cal. Acad. Sci., Vol. Ill, 1865, 

 p. 224. Tkyon, Man. Coiuh., \'ol. II, ji 42. 18S0. Coopfr, ytli Ann. RejiLCal. St. 

 Min., 1SS8, p. 26S. 



Tiophou ( Jiotfotrop/ion) Iriangu/iiliis Cl'K., Dali., Proc. U. S. Nat. Mus.. \'ol. XIV, 1S91, |>. iSO, 

 PI. V, fijjs. I. 3 anil 6; Vol. XV, 1892, ji. 216. 



"Whorls about seven, tlie nuclear lost; varices si.x In tin- wliorl, stronj;, wide, thincilfied, 

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

 jirowtli and hall" obsolete, fine, irregular, spiral scratches, stronjjest on the body and almost wholly 

 wantini; between the suture ami the spines; the aperture in some specimens might be denticulate. 



" Pimetisions. — Long. 75 mm.: lat. 50 mm.; aperture 56 mm." 



As the only shell t'oiiiid in ilio Pleistocene was an extremely yoiinii !""' worn 

 specimen, the above, taken tioni a ilesciiiition hy Dr. Dail (Proc. U. S. Nat. Mus., 

 Vol. XIV, p. lyO), is inserted. The IMeistocene specimen inoasnres \) mm. in 

 length, ami has nine varices. The young of this species is distinguishahlc from tiie 

 young of T. gracU'iK hy having a shorter canal and less prominent varices. 



Rare in lower 8an Pedro scries of De:ulm;in Island. 



Living. — Santa Cruz T.-^land to Catalina; Lower California (Cooper): San 

 Pedro (Williamson). 



Pleistocene. — Santa Barbara (Cooper): San Pedro (Arnold). 



Genus Ocinebra Le.ach. 



Shell small, with numerous varices which are foliated and often spinose; spiral sculpture; 

 canal more or less closed. 



Ocinebra erinaceus Linn, is a characteristic species. 

 258. Ocinebra barbarensis Gabb. 



Plate V, Fio. 1. 



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



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



Ocinebra barbarensis Gabb, Tryon, Man. Conch., Vol. II, ]i. 124, 1880. 



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

 or concave above, slightly conve.\ 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 stairca.se 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. 19 mm.; lat. 10 mm.; body-whorl 15 mm.; aperture, including 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 taljulated upper 

 portion of whorl. Specimens identified by Dr. Dail. 



