324 CALIFORNIA ACADEMY OF SCIENCES. 



Shell smaller than L. carpenleri; whorls ornamented with very prominent, coarse spiral 

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

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



Dimensions. — Alt. 4 mm.; lat. 5 mm.; defi. 100 degrees. 



Distinguishable from L. carpenteri and L. bacula by the coarse spiral ribs and 

 deep suture. 



Two specimens found in the lower San Pedro series of San Pedro. Found in 

 the Pleistocene at the bath-house, Santa Barbara. 



Living. — ^Santa Cruz to Monterey (Cooper). 



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



Family LXXXIV. TROCHID/E. 

 Genus Chlorostoma Sv^dinfton. 



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

 smooth or subcarinated, the last subangulated at the base; coJumeliar lip spirally twisted around the 

 umbilicus; outer lip angulated at the base. 



Chlorostoma argyrostroma Cheran. i.s a characteristic species. 



371. Chlorostoma aureotinctum Forbefs. 



Trochus Mireotinclus Fbs., Proc. Zool. Soc, 1850, p. 271. Fischer, Coq. Viv., Turbo, p. 94, 



PI. XXXI, fig. I. 

 Chlorostoma aureotinctum Fbs., Cpr., Brit. Assn. Rept., 1S63, p. 652. Coopek, 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, p. 84, 1892. Williamson, Proc. U. S. 



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



Shell conoidal, spire somewhat elevated; apex 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 lirulae 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.; defl. 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 PhiUppi. 



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

 Meers. Conchyl., p. 99. Fischer, Coq. Viv., p. 365, PI. CXIl, fig. i. 



Chlorostoma brumieum 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. Tryon, 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. 



