ARNOLD — THE PALEONTOLOGY AND STRATIGRAPHY OP SAN PEDRO. 209 



i8o. Drillia torosa Carpenter. 



DrilUa torosa Cpr., Brit. Assn. Rept., 1S63, p. 657; Jour, de Conch., 3rd Sen, Vol. XV, 1865, p. 145. 

 Tkyon, Man. Conch., Vol. VI, p. 1S3, PI. XIV, fig. 93, 1884. Cooper, 7th Ann. Rept. 

 Cal. St. Min., 18SS, p. 239. Keep, West Coast Shells, p. 56, fig. 59, 1892. William- 

 son, Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 298. 



Shell elongated; spire elevated; apex acute; whorls eight, angulated near middle, with row 

 of about nine nodes, transversely elongated, on angle; the upper portion of whorl flat to concave; 

 anterior half of whorl spirally striated; incremental lines visible, oblique, and on upper part of whorl, 

 concave anteriorly; suture impressed, distinct; lower portion of body- whorl and columella spirally 

 striated; aperture elliptical; outer lip thin and arcuate anteriorly; inner lip and columella slightly 

 incrusted; posterior sinus shallow; anterior sinus short, straight. 



Dimensions. — Long. 25 mm.; lat. 8 mm.; body-whorl 14.5 mm.; aperture, including 

 canal 9.5 mm.; defl. 22 degrees. 



Distinguishable by tlie nodose whorls. The relative length of canal varies 

 somewhat in this species, as does also the prominence of the nodes. 



Found in the Pliocene at Deadman Island and Timra's Point; in the lower 

 San Pedro series at Deadman Island and San Pedro; and in the upper San Pedro 

 series at Deadman Island, San Pedro, Los Cerritos, and Crawtish George's. Most 

 common in the lower formations. 



Living. — Santa Cruz to Santa Barbara (Cooper): San Pedro (Williamson). 



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



Pliocene. — Sau Pedro (Arnold). 



Genus Bela Gray. 



Shell oval, fusiform, thin; spire produced; canal short; sinus small, near the suture; columella 

 flattened; operculum pointed at both ends. 



Pleurotoma turricula Montf. is a characteristic species. 



181. Bela fidicula Gould. 



VuKTi. VII, Fig. 10. 



Fusus JidiculaGhXi., Proc. Bost. Soc. Nat. Hist., Vol. Ill, 1849, p. 142; Wilkes' Expl. Exped., 



Vol. XII, p. 233, fig. 284, 1852. 

 Bela fidicula Q\:d., Cpr., Brit. Assn. Rept., 1863, p. 658. Tryon, Man. Conch., Vol. VI, p. 222, 



PI. XXXII, fig. 17, 1884. 



Shell small, thin, turreted, short, fusiform; whorls seven, angular, forming a broad shoulder at 

 the suture; surface sculptured with delicate, regular, obtuse, transverse rib-folds, about twenty-four 

 on the last whorl, on the middle of which they disappear, decussated by more crowded, delicate 

 grooves, a little undulating, about eight on the penultimate whorl; suture deeply impressed, distinct; 

 aperture narrow, elliptical; outer lip thin, slightly arcuate; pillar smooth interiorly, spirally striate 

 e.xternally; canal short. 



Dimensions.- — Long. 10 mm.; lat. 4.1 mm.; body-whorl 6.8 mm.; aperture 5 mm.; defl. 

 30 degrees. 



Found in Pliocene at Deadman Island, lower San Pedro series at Deadman 

 Island, and upper San Pedro series at Crawfish George's. Found also in the Pleistocene 



( 27 ) March U, 190J. 



