326 CALIFORNIA ACADEMY OF SCIENCES. 



375. Chlorostoma gallina Forbes. 



Trochus (Monodonta) gallina Fes., Proc. Zool. Soc, 1850, p. 271, PI. XI, fig. 8. 



Trochus gallina Fes., Fischer, Coq. Viv., p. 258, PI. CXI, fig. i. 



Chloroslotna gallina Forbes, Cpr., Brit Assn. Rept., 1863, p. 652. Tryon, Man. Conch., Vol. XI, 

 p. 169, PI. XX, fig. 15; PI. XXVIII, figs. 52 and 53, 1889. Keep, West Coast Shells, 

 p. 84, fig. 70, 1892. WiLLi.AMSON, Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 200. 



Shell conoidal, thick; whorls five, flat, slightly shouldered posteriorly near suture in some 

 specimens; ornamentation consists of numerous obsolete spiral ridges, and irregular, oblique, trans- 

 verse ridges of varying prominence; suture distinct; umbilicus nearly obsolete; base flat, same orna- 

 mentation as whorls; outer lip effuse, with prominent tubercle near umbilicus. 



Dimensions. — Long. 20 mm.; lat. 21 mm.; defl. 80 degrees. 



Most specimens show oblique, alteriiuting dark and liglit, irregular lines, 

 which characterize the living shells. 



Rare in upper San Pedro series of San Pedro, Crawfish George's, and Dead- 

 man Island. Found in the Pleistocene at Pacific Beach, San Diego. 



Living. — Santa Barbara Islands to Lower California (Carpenter). 



Fleidocene. — San Pedro; San Diego (Arnold). 



376. Chlorostoma montereyi Kiener. 



Platf. X, Fig. 19. 



Trochus montereyi KiENER, Species Trochus, PI. XXXIII, figs, i and la. Fischer, Coq. Viv., 



p. 104, PI. XXXIII, fig. I. Tryon, Man. Conch., Vol. XI, p. 171, PI. XXVII, 



figs. 27, 28, 29, 1889. 

 Omphalius pfeijferi ^uii^., Cpr., Proc. Zool. Soc, 1856, p. 200. 

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



1869. Cooper, 7ih Ann. Rept. Cal. St. Min., 18S8, p. 234. Keep, West Coast 



Shells, p. 83, 1892. 

 Chlorostoma montereyensis Kien. , Williamson, Proc. U. S. Nat. Mus., Vol. XV, 1892, p. 200. 



Shell conical; whorls seven, flat (on some specimens the whorls have a shoulder on the 

 posterior part); suture distinct but not impressed; surface of upper five or si.\ whorls ornamented 

 with five flat, spiral ridges, the space between the ridges being crossed by minute incremental lines, 

 which slope anteriorly at quite an angle; ornamentation on the rest of the whorls indistinct; base 

 flat, indistinctly ornamented as on the upper whorls; umbilicus open, smooth and slightly keeled 

 aperture elliptical. 



Dimensions. — Alt. 35 mm.; lat. 33 mm.; defl. 65 degrees. 



The specimen described was identified by Dr. Dall. 



Found in the Pliocene of Deadman Island; in the lowei' San Pedro series 

 of Deadman Island; and in the upper San Pedro series of Deadman Island, Crawfish 

 George's, and San Pedro. Found in the Pleistocene at Pacific Beach, San Diego. 

 The specimen figured is from tiie upper San Pedro series at Crawfish George's, and 

 is now in the collection of Delos Arnold. 



Living. — Bauliiias Bay to San Diego (Cooper). 



