256 CALIFORNIA ACADEMY OF SCIENCES. 



JRather common in upper San Pedro series at San Pedro; one in Pliocene at 

 Deadman Island; found also in Lower San Pedro series at Deadman Island and San 

 Pedro, and in the npper San Pedro series at Crawfish George's and Deadman Island. 

 Found also in the Pleistocene at Pacific Beach, San Diego. 



Living. — Sitka to San Diego (Cooper). 



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



Pliocene. — San Pedro (Arnold). 



261. Ocinebra keepi, sp. nov. 



Plate V, Fig. 9. 



Shell of medium size, fusiform; spire elevated, subacute; whorls five to six, strongly angu- 

 lated above, giving a tabulate appearance to upper portion; whorls crossed by about seven sharp 

 frills, which flex forward, and rise to prominent points on the angle; anterior portion of whorl 

 ornamented with five or six strong, rough, subangular spiral lines, more prominent on lower 

 portion of whorl; posterior portion of whorl smooth between frills, except near suture, where the 

 surlace is roughened by laminated, incremental lines; suture deeply appressed, undulating, distinct; 

 aperture subelliptical; outer lip thickened and slightly denticulated; inner lip enameled, slightly 

 projecting; columella twisted, squamosa, only slightly widened; umbilicus subperforate; canal of 

 medium length, narrow, sometimes covered with overgrowing lips. 



Dhnensions. — Long. 35.5 mm.; alt. 21 mm.; body-whorl 26.5 mm.; aperture 20 mm.; canal 

 7.5 mm.; defl. 56 degrees. 



Distinguishable from other members of the genus by the transverse frills. 

 The type specimen shows the original reddish brown color. Pronounced a new 

 species by Dr. Dall. Named in honor of Professor Josiali Keep of Mills College, 

 who has done so much toward advancing the study of conchology on the Pacific Coast. 



Rare in upper San Pedro series at San Pedro; type specimen found at Dead- 

 man Island in the upper San Pedro conglomerate. The si^ecimen figured is the 

 type, which is now in the United States National Museum. One specimen from the 

 upper San Pedro series at the lumber yard, San Pedro. 



Fleisiocene. — San Pedro (Arnold). 



262. Ocinebra lurida Middendorf . 



Tritonium tnridum Midd., Mai. Ross., PI. il., p. 150, PI. IV., figs. 4, 5, 1849. 



Ocinebra lurida Midd., Cpr., Brit. Assn. Re|)t., 1863, p. 663. Gabb, Pal. Cal. , Vol. II., |). 70, 1869. 

 Trvon, Man. Conch., Vol II , p. 131, PI. XXXIX, figs. 481, 4S5, 1888. Keep, West 

 Coast Shells, p. 23, fig. 4, 1892. Williamson, Proc. U. S. Nat. Mus., Vol. XV, 

 1892, p. 215, PI. XX, fig. 3. 



Shell of medium size, fusiform; whorls six, convex, slightly angulatcd near posterior margin; 

 upper whorls with several transverse ridges; surface ornamented with numerous rounded, raised 

 lines; suture deeply impressed, distinct; body-whorl not extraordinaril yventricose; aperture sub- 

 ovate; outer lip thickened, denticulated; inner lip incrusted; columella widened; umbilicus subper- 

 forate; canal narrow, sometimes covered with overgrowing lips. 



Dimeyisions. — Long. 25 mm.; lat. 13.3 mm.; defl. 55 degrees. 



