200 CAUFOKNIA ACADEMY OK SCIKNCES. 



to intcrgrade, and tlicv do not vary cnoiij;;h to justify making a variety out of (lie 

 new form. 



Found in tlie lower f^an I'edro scries at Dcadman Island; and in the uj)|>er 

 San Pedro series at Dcadman Island, San Pedro, and Crawfish CJeorge's. Found in 

 the Pleistocene at l)ath-house, Santa Barbara; and Pacific Beach, San Diego. 



Living. — Santa Barbara to Lower California (Cooper). 



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



269. Ocinebra poulsoni Xulhill. 



Plate V, Fl(i. 2. 



Ocinebra pmlsoni Nutt., Cpr., Brit. Assn. Rcpt., 1S63, p. 663. Nuttai.i., niss., Cpk., Jour. 

 de Conch., Vol. XII, 1865, p. 148. Trvon, Man. Conch., Vol. II, p. 130, PI. 

 XXXVIII, fig. 475, 1880. Keep, West Coast Shells, p. 23, 1892. Williamson, Proc. 

 U. S. Nat. Mus., Vol. XV, 1892, p. 215. Cooper, Bull. No. 4, Cal. St. Min. Bureau, 

 Part 3, 1894, p. 30. 



Shell of medium size, elongate-fusiform; spire elevated, compact; whorls six, deeply concave 

 above, convex below, with rounded transverse ridges rising to prominent nodes on angle of lower part 

 of whorl; nuclear whorls coarsely cancellated; ridges obsolete on concave portion of whorl; more or 

 less prominent spiral ridges on lower portion of whorl; spiral sculpture faint on concave surface; fine 

 incremental lines quite prominent; suture not deeply appressed, wavy; aperture semielliptical; 

 outer lip denticulated; inner lip effuse, incrusted, smooth; canal short, narrow; columella slightly 

 twisted, widened; umbilicus subperforate. 



Dimensions. — Long. 32 mm.; lat. 16.5 mm.; body-whorl 23 mm.; aperture 16 mm.; canal 

 5 mm. ; defl. 42 degrees. 



The specimen described is a narrow form, some of the specimens showing a 

 deflection of 55 degrees. INIany of the specimens retain the coloration of the brown 

 spiral bands. Specimens identified by Dr. Dall. 



Rare in lower San Pedro series at Dcadman Island and San Pedro; not 

 uncommon in upper San Pedro series at San Pedro, Los Cerritos, Crawfish George's, 

 and Deadman Island. Found also in the Pleistocene at Twenty-sixth Street, San 

 Diego. The specimen figured is from the upper San Pedro series at San Pedro, and 

 is now in the collection of Delos Arnold. 



Living. — Santa Barbara to San Diego (Cooper): Lower California (Carpenter). 



Pleistocene. — Ventura (Bowers): San Pedro; San Diego (Arnold). 



Subfamily PURPURIN^E. 



Genus Purpura Bruguifre. 



Shell oblong-oval, last whorl large; spire generally short; aperture ovate, large, terminating 

 in a very short oblique channel, or notched; columella flattened; outer lip simple. 



Purpura persica Linne is a typical species. 



