824 C'ALIFOUNIA ACADKMY OK S(IKNC15S. 



Shell smaller than L. carpenUri; whorls ornaiiuiilcil with very i)romiiicnt, coarse spiral 

 ridjjes; a typical specimen showing six on the body-whorl and two small ones in umbilical region; 

 suture deeply impresseii, distinct; aperture circular; lip thick, with tubercle on lower part. 



Diviensions. — Alt. 4 nun.; lat. 5 mm.; dell. 100 degrees. 



Distiiigiiisliablc from h. carpeiiteri and A. hncula by tlie coarse spiral ril)s and 

 dceji silt tire. 



Two specimens foniul in the lower San Pedro series of San Pnlrn. Found in 

 tiio Pleistocene at the hatli-honso, Santa Barbara. 



Living. — Santa (.'iiiz to Monterey (Cooper). 



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



Family LXXXIV. TIM )('II1 D.E. 



Genus Chlorostoma Suuinson. 



Shell conoidal, profoundly umbilicated, or umbilical region covered by a callosity; whorls 

 smooth or subcarinated, the last subangulated at the base; colunicll ir lip spirally twisted ardinul the 

 umbilicus; outer lip angulated at the base. 



Chlorostoma argyrostroma Chemn. is a characteristic sj)ecies. 



371. Chlorostoma aureotinctum Forben. 



Trochus aureotinclus Fbs., Proc. Zool. .Soc, 1850, ji. 271. Fischeu, Coq. Viv., Turbo, p. 94, 



PI. XXXI, fig. I. 

 Chlorostoma aureolinctum Fns., Cpr., Rrit. Assn. Rept., 1S63, p. 652. Coopkk, 7th Ann. Rtpt. 



Cal. St. Min., 1888, p. 234. Trvon, Man. Conch., Vol. XI, p. 172, PI. XXVII, 



figs. 31-33, 1889. Keep, West Coast Shells, [>. 84, 1892. Williamson, Proc. U. S. 



Nat. Mus., Vol. XV, 1892, p. 200. 



Shell conoidal, spire somewhat elevated; ape.x obtuse; whorls four, slightly convex; body- 

 whorl subangular at base; surface roughened by prominent^ rounded, irregular, transverse ridges, 

 which appress against the antecedent whorls and become obsolete at the angles of the whorl; lower 

 portion of whorl smooth, as is the whole surface of the two posterior whorls; suture distinct; base of 

 body-whorl furrowed with four grooves which show transverse incremental liruke at their bottoms; 

 umbilicus deep and effuse, with bright, yellow stain in the living shell; aperture circular; columellar 

 lip slightly twisted around umbilicus; outer lip with two small tubercles on inner side of base. 



Dimensions. — Alt. 10 mm.; lat. 17.5 mm.; defi. 100 degrees. 



Rare in upper San Pedro series of San Pedro. 

 Living. — Santa Barbara to Lower California (Cooper). 

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



372. Chlorostoma brunneum Philippi. 



Trochus bniwieus Phil., Zeits. Monog. Troch., p. 300, PI. XLIII, fig. 19, 1848. Lischke, Jap. 

 Meers. Conchyl., p. 99. F"ischer, Coq. Viv., p. 365, PI. CXII, fig. i. 



Chloroslotna brunneum Phil., Cpr., Brit. Assn. Rept., 1863, p. 652. Gabb, Pal. Cal., Vol. II, p. 84, 

 1869. Cooper, 7th Ann. Rept. Cal. St. Min., 1888, p. 234. Trvon, Man. Conch., 

 Vol. XI, p. 170, PI. XXVII, figs. 36-38, 1889. Keep, West Coast Shells, p. 83, 

 fig. 69, 1892. Williamson, Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 200, PI. XXI, fig. 8. 



