260 CALIFORNIA ACADEMY OF SCIENCES. 



to intergrade, and they do not vary enough to justify making a variety out of the 

 new form. 



Found in the lower San Pedro series at Deadman Island; and in the ujijier 

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

 the Pleistocene at bath-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 XiUtall. 



Plate V, Fig. 2. 



Ocinebra poidsoni NuTT., CpR., Brit. Assn. Rept., 1863, p. 663. Nuttall, mss., Cpr., Jour, 

 de Conch., Vol. XII, 1865, p. 148. Tryon, 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. Many of the specimens retain the coloration of the brown 

 spiral bands. Specimens identified by Dr. Dall. 



Rare in lower San Pedro series at Deadman 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 Bruguiere. 



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 Linuc is a typical species. 



