ARNOLD — THE PALEONTOLOGY AND STKATIGEAPHY OF SAN PEDRO. 265 



Shell thick, elongated; spire elevated; apex acute; whoils ten, rounded, with twelve to 

 sixteen heavy, reflexed varices; varices striated with fine incremental lines; suture deep; aperture 

 subcircular; inner lip thickened, forming columella. 



Dimetisions. — Long. 26.5 mm.; lat. 9 mm.; defl. 32 degrees. 



Distinguishable from *S'. tincta by heavier shell, thicker and generally more 

 numerous varices, which are reflexed, and by a more .solid appearance caused by the 

 less sunken suture; distinguishable from S. himhii by more whorls, thicker shell, 

 more varices, which are thicker, more reflexed and less coronate, and by less promi- 

 nent sutures; distinguishable from S. crebricostata by thicker shell, thicker varices, 

 which are more reflexed, and by a less prominent suture. Several specimens of 

 this species were identified by Dr. Dall. 



Two from the Pliocene of Deadman Island; common in the lower and upper 

 San Pedro series of San Pedro and vicinity. The specimen figured is from the 

 upper San Pedro series at San Pedro, and is now in the collection of Delos Arnold. 



Living. — Straits of Fuca to San Diego (Cooper). 



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



Pliocene. — San Pedro (Arnold). 



278. Scala tincta Carpenter. 

 Plate V, Fig. 3. 



Scalaiia iincla Cpr., Brit. Assn. Rept., 1S63, p. 660. Cooper, 7th Ann. Rept. Cal. .St. Min., 1888, 



p. 263. 

 Scalaria indianoriim max. tincta Cpr., Ann. & Mag. Nat. Hist., 3rd Ser. , Vol. XV, 1S65, p. 31. 



Tryon, Man. Conch., Vol. IX, p. 70, PI. XIV, fig. 49, 1887. 



Shell thin, elongate; spire elevated; apex acute; whorls nine to ten, rounded, with ten to 

 twelve thin varices, which are generally not reflexed; suture deep; aperture subcircular; inner lip 

 only slightly thickened. 



Dimensions. — Long. 25 mm.; lat. 10 mm.; defl. 28 degrees. 



Distinguishable from 8. indianornm by more delicate shell, thinner varices, 

 which are not reflexed as a rule, thinner lip and much deeper suture; distinguishable 

 from ti. JiiiuUii by more numerous varices, which lack the distinct coronatioii, and by 

 more whorls and less deflection; distinguishable from S. crebricostata by fewer and 

 less reflexed varices. Specimens identified by Dr. Dall. 



Rather common in upper, and rare in lower San Pedro series of San Pedro 

 and vicinity. Found in the Pleistocene at Barlow's ranch, Ventura; at Pacific 

 Beach and Twenty-sixth Street, San Diego; and in the Pliocene at Pacific Beach 

 and Russ School, 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 Cruz to San Diego (Cooper). 



( 34 ) March 27, 1903. 



