Geol— Vol. II.] ANDERSON— CRETACEOUS DEPOSITS. 83 



Lytoceras baiesi, occurring lower in the series. Aiinjwnitcs 

 whitneyi has not yet been clearly recognized as a distinct 

 species, and to any one familiar with the fauna of this hori- 

 zon there can hardly be a doubt that Gabb's species and 

 Lytoceras sacya are the same. Gabb's figure is apparently 

 defective, showing too deep and too early constrictions on 

 the shell. On older specimens of Lytoceras sacya these 

 appear to be constant, but are lacking on shells below a 

 diameter of 6.33 centimeters. 



Occurrence. — Lytoceras sacya occurs in the Upper Horse- 

 town beds of California, and the Lower Chico beds of 

 California and Oregon, and in beds equivalent to the 

 Upper Horsetown on Queen Charlotte Islands. 



22. Lytoceras (Gaudryceras) kayei Forbes. 



Ammonites kayei Forbes, Trans. Geol. Soc. Lond., Ser. II, Vol. VII, 



1845-56, p. lOI. 

 Ammonites tiayei (?) (Forbes) Stol., Pal. Ind., Vol. I, p. 156, PI. LXXVII, 



fig. I. 

 Lytoceras tiayei Forbes, Stein., Jahrb. f. Min., etc., Bell.-Bd. X, 1895-96, 



p. 86. 



Shell discoidal, thin, increasing very slowly in diameter; section of the 

 whorls transversely elliptical; umbilicus wide and shallow, coils small, orna- 

 mentation simple, surface crossed by oblique lines and a few moderately 

 deep grooves. Septation well represented by Steinman's figure (1. c, p. 87). 



There are few more interesting discoveries here noted 

 than the identification of this characteristic Upper Creta- 

 ceous species from the Chico beds of California. The 

 shell in all of its details of ornamentation and sutures is 

 almost the exact facsimile of the species from the west 

 coast of Chile and from the Pondicherri District of Southern 

 India, as well as can be judged from the figures. 



Occurrence. — A single well preserved specimen from 

 Mount Diablo is in the collections of the University of 

 California. 



