8o CALIFORNIA ACADEMY OF SCIENCES. [Proc. .^d Ser. 



Occurrence. — The species occurs with the preceding at 

 Phoenix, Henley, and Arroyo del Valle, and Dr. Smith 

 states that he has found it in the Lower Chico beds of the 

 Silverado Canyon, Orange County, California. 



17. Phylloceras shastalense, sp. nov. 



Plate IV, Figs. 112-115. 



Shell small, inflated, not globose, rapidly increasing in width; section of 

 body-whorl nearly circular, but in younger stages elliptical; umbilicus closed, 

 or not showing any of the earlier whorls, except in minute specimens; surface 

 crossed by transverse ribs that are tolerably coarse compared with those of 

 other species lower in the series. The ribs begin at the umbilical depression 

 and run transversely over the ventral surface, making only slight curves. 

 The diameter of the largest specimen found is 3 cm., from which most of the 

 body-chamber is missing. The suture is clearly that of a Phylloceras. It 

 does not appear to be closely related to either of the previously known forms 

 of this genus from the Pacific Coast. It is more nearly allied to Ammonites 

 rouyanus d'Orbigny'^ though less flattened ventrally than this species, as 

 represented in the figure. 



Occurrence. — This species is quite common at Ilorsetown, 

 Shasta County, California, where four or five good speci- 

 rhens were recently collected. 



The type is in the collection of the University of 

 California. 



18. Schliiteria diabloensis, sp. nov. 

 Plate III, Figs. 105-106. 



Among the ammonites labeled by Gabb ^^Am. jugalis'' 

 is an undescribed species of Schliiteria for which the name 

 S . diabloensis is here proposed. 



The greatest diameter of the largest specimen is 2.5 cm., with a thickness 

 near the umbilicus of 1.2 cm. The umbilicus is small, with sides that become 

 very abrupt at this diameter, though the younger portion of the shell shows 

 more gentle slopes. The sides are apparently smooth or marked with a few 

 faint transverse grooves, and are flattened and gently converge outward. 

 The fine lines of growth curve a little backward after crossing the umbilical 

 shoulder. The suture is that of a Desmoceras, though in shape and gen- 

 eral appearance the species might be considered a Phylloceras. 



spal. Franc. Terr. Cret., Vol. I, PI. CX, figs. 3-5. 



