ARNOLD— THE PALEONTOLOGY AND STRATIGRAPHY OF SAN PEDRO. 255 



Rare in the lower San Pedro series at Pan Pedro and Deadmaii Island. 

 Found also in the Pleistocene at Santa Barbara. The specimen figured is from 

 the lower San Pedro series at Deadman Lsland, and is now in the collection of 

 Delos Arnold. 



Living. — Catalina Island; Santa Baibara Channel (Cooper). 

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



259. Ocinebra foveolata Hinds. 



Murcx foveolala Hds., Proc. Zool. Soc, 1S43, P- '-71 Voyage Sulphur, p. 9, No. 13, PI. III. tigs. 



15, 16, 1S44. Cpr., Brit. A.ssn. Rept., 1856, p. 205. Tryon, Man. Conch., Vol. II, 



p. 125, PI. XXXVIII, tig. 465, 1880. 

 Mjoicidea foveolala Hds., CoopiiR, 7th Ann. Rept. Cal. St. Min., 1888, p. 252. 

 Ocinebra foveolata Hds., Williamson, Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 215. 



Shell of medium size, fusiform; spire elevated; whorls six, angulated, with six or seven 

 prominent, rounded, transverse ribs that rise to the prominence of nodes on the angle of the whorl; 

 surface ornamented with numerous clear-cut, rather squarish, raised lines, and incremental lirulae in 

 the interspaces; suture deeply appressed, wavy; aperture subpyriform; outer lip thickened, denticu- 

 lated; inner lip incrusted, smooth; canal long, narrow, slightly curved; columella not perceptibly 

 widened; umbilicus subperforate. 



Dimensions. — Long. 35 mm.; lat. 17 mm.; body-whorl 28 mm.; aperture, including canal, 

 20 mm.; canal g mm.; defl. 60 degrees. 



Distinguishable by the broad, prominent, transverse ridges which rise to 

 rounded nodes rather than to sharp points, as in some other members of the genus, 

 and by the deep suture and lather long, narrow form of the shell. Specimen identi- 

 fied by Dr. Dall. Specimens of 0. periia in the State Museum collection of fossils at 

 Berkeley are labeled ''0. foveolata." 



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



Living. — Baulinas Bay to Lower California (Cooper). 



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



260. Ocinebra interfossa Carpenter. 



Ocinebra interfossa CpR., Brit. Assn. Rept., 1863, p. 663. Gabb, Pal. Cal., Vol. II, p. 70, 1869. 

 Tryon, Man. Conch., Vol. II, p. 131, PI. XXXIX, fig. 484, 1880. Cooper, 7th Ann. 

 Rept. Cal. St. Min., 1888, p. 254. Keep, West Coast Shells, p. 24, fig. 5, 1892. 

 Williamson, Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 215. 



Shell small, broadly fusiform; spire elevated, subacute; whorls five or six, angulated above; 

 surface sculptured with numerous transverse and spiral ridges of nearly equal prominence, giving the 

 surface a latticed appearance; suture deeply impressed, distinct; aperture subovate; outer lip 

 thickened, slightly denticulated; inner lip smooth, incrusted; canal short, generally covered; 

 columella twisted, squamose; umbilicus subperforate. 



Dimensions. — Long. 13 mm.; lat. 7.2 mm.; body-whorl 10 mm.; aperture, including canal, 

 7 5 mm.; canal 2.5 mm.; defl. 55 degrees. 



Distinguishable from other members of genus by strong, latticed sculpture, 

 short canal and small size. Identified by Dr. Dall. 



