:?24 CALIFDUNIA ACADKMY OF SCIENCES. 



Shell smaller than L. carpenleri; whorls ornamented with very i)roniinent, coarse spiral 

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

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



Dimensions. — Alt. 4 mm.; lat. 5 mm.; de(l. 100 tlegrees. 



Distlngiiisliable from L. carpentcri and A. Imcula by tlic coarse spiral ribs and 

 dee|> suture. 



Two specimens found in the lower 8an Pedro series of San Pedro. Found in 

 tlic Pleistocene at the bath-honse, Santa Barbara. 



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



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



Family LXXXIV. TROCIIID.K. 

 Genus Chlorostoma Sirainson. 



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

 smooth or subcarinated, the last subangulated at the Ij.isc; colunnll.u- lip spirally twisted around the 

 umbilicus; outer lip angulated at the base. 



Chlorostoma argyrostroma Chemn. is a characteristic species. 



371. Chlorostoma aureotinctum Forbes. 



Trochiis aureotinclus Feb., Proc. Zool. Soc, 1850, p. 271. F'ischek, Coq. Viv., Turbo, p. 94, 



PI. XXXI, fig. I. 

 Chlorostoma aureotinctum Fns., Cpr., Brit. Assn. Rept., 1863, p. 652. Cooi'i;k, 7th Ann. Rtpt. 



Cal. St. Min., 1888, p. 234. Tryon, Man. Conch., Vol. XI, j). 172, PI. XXVII, 



figs. 31-33, 1889. Keep, West Coast Shells, p. 84, 1S92. Williamson, Proc. U. S. 



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



Shell conoidal, spire somewhat elevated; ape.x oijtusc; 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; colunuUar 

 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 Philippi. 



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

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



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

 1869. Cooper, 7th Ann. Rept. Cal. Sl Min., 1888, p. 234. Tryon, Man. Conch., 

 Vol. XI, p. 170, Pl. 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. 



