204 CALIFORNIA ACADEMY OF SCIENCES. 



Genus Drillia Gray. 



Shell turriculated; aperture oval, oblique; canal short, twisted; columella lip strongly 

 callous above. 



Pletiratoma (jibhosa Kiener is a characteristic species. 



171. Drillia cancellata Carpenter. 



Drillia canal/afa Cv^., Brit. Assn. Rept., 1863, p. 658; Proc. Phil. Acad. Nat. Sci., 1865, p. 63. 

 Tryon, Man. Conch., Vol. VI, p. 183, 1884. 



Shell resembles D. hiermis in shape; whorls eight or nine, nearly flat, but slightly angulaled 

 near anterior margin; decoration consists of five to six spiral ridges and about twenty-five rather 

 more prominent transverse, slightly oblique ribs, the whole giving the whorls a cancellated appear- 

 ance; suture impressed, distinct; canal long, prominent. 



The four specimens found were youug, and no adult lias so far been recorded 

 from this formation. 



Found in the lower San Pedro series of Deadman Island, and in the upper 

 San Pedro series of Los Cerritos. Found in the Pleistocene at Spanish Bight, 

 San Diego. 



Living. — Puget Sound (Carpenter). 



Pleistocene. — San Pedro; San Diego (Arnold). 



172. Drillia hemphilli Stearns. 



' Plate V, Fio. 8. 



Drillia hemphilli Stearns, Proc. Cal. Acad. Sci., Vol. V, 1874, p. 80, PI. I, fig. 3. Tryon, Man. 

 Conch., Vol. VI, p. 185, PI. XIII, fig. 49, 1884. 



Shell small, elongate, slender; apex acute; whorls eight, slightly convex, with fifteen 

 distinct, transverse, slightly oblique, rounded ribs; flat anterior sutural riblet about one-fifth the 

 width of whole whorl; suture impressed, distinct; spiral sculpture consists of a few faint grooves; 

 outer lip thin, bulging anteriorly below posterior sinus, which is deep and narrow; anterior sinus 

 short; inner lip and inner side of columella incrusted. 



Dimetisions. — Long. i6nmi.; lat. 5 mm.; body-whorl 8 mm.; aperture, including canal, 

 5.5 mm.; defl. 20 degrees. 



The speciinen described is the largest one found, the normal length being 

 about 10 mm. Distinguishable by its small size, prominent sutural riblet, and 

 oblique transverse ridges. 



Found in lower San Pedro series of Deadman Island and San Pedro, and in 

 the upper San Pedro series of Los Cerritos, San Pedro, and Crawfish George's. 

 Found in the Pleistocene at Barlow's ranch, Ventura; and at Spanish Bight and 

 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. — Lower California (Stearns). 



Pleistocene.— ^an Pedro; Ventura (Arnold): San Diego (Stearns; Arnold; 

 Hemphill). 



