ARNOLD — THE PALEONTOLOGY AND STRATIGRAPHY OF SAN PEDRO. 263 



273. Scala bellastriata Carpenter. 



Platk IX, Fit;. 17. 



Scalaria bellastriata CVK., Brit. Assn. Rept., 1S63, p. 660; Proc. Cal. Acad. Sci., Vol. Ill, 1864, 

 p. 22. Gabb, Pal. Cal., Vol. II, p. 78, 1869. Cooper, 7th Ann. Rept. Cal. St. Min., 

 1SS8, p. 263. 



Scala bellastriata Cpr., Williamson, Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 209. 



Shell conical, with elevated' spire; whorls six, rounded, each having fifteen thin varices; 

 suture almost separating whorls; varices spinous at shoulder, a few of the varices thickened; inter- 

 varical spaces ornamented with spiral ridges; aperture slightly elliptical, with longer axis vertical. 



Dimensions. — Alt. 17.5 mm.; lat. 10 mm.; defl. 42 degrees. 



This species is easily distiiiiiuishable by its low spire and by its spiral orna- 

 meutatioD. The only other member of this genus fouiul in this locality which has 

 spiral sculpture is S. hemphilli, which has a much slenderer spire and a less im- 

 pressed suture. The figure of this species is of a living shell from San Pedro, which 

 is now in the collection of Dclos Arnold. 



Bare; only four found in the upper San Pedro series of San Pedro. 



Living. — San Pedro to San Diego (Cooper). 



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



274. Scala crebricostata Carpenter. 



Scalaria crebricostata Cpr., Brit. Assn. Rept., 1863, p. 660; Proc. Cal. Acad. Sci., Vol. Ill, 1864, 

 p. 222. Gabb, Pal. Cal., Vol. II, p. 78, 1869. Cooper, 7th Ann. Rept. Cal. St. Min., 

 1888, p. 263. 



Shell turreted, thin; spire consists of eight convex whorls, each with fourteen to eighteen 

 slightly oblique, sharp, thin, reflexed, transverse varices; varices show a slightly coronate appearance 

 at the shoulder; suture deep and distinct. Deflection 22 degrees. 



Some of the specimens have only slightly reflexed varices, and the amount of coronation 

 varies in different individuals. 



Distinguishable from 8. indianorum by thinner shell, thinner and sharper 

 varices, and more impressed suture; distinguishable from S. tincta by more numerous, 

 and generally more reflexed varices; distinguishable from S. hindsii by more numer- 

 ous and less coronated varices. Specimens identified as questionable by Dr. Dall. 



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

 in lower San Pedro series at San Pedro. Found in the Pleistocene at Barlow's ranch 

 and irrigating ditch, Ventura; and at Twenty-sixth Street, San Diego. 



Living. — Monterey to San Diego (Cooper). 



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

 Diego (Arnold). 



