CEPHALOPODA. 



97 



No. 185. [467, Cast]. Ammonites armatus, Sowerby. 



This species is typical of Vou Biich's Group 

 " Armati." From the Lower Lias, Cliar- 

 mouth, Eu2;laud. 



No. 186. [470, Cast]. Ammonites athletus, Phillips. 



From the Kelloway Rock (Middle Oolite), Yorkshire, Eugland, and now in 

 the Ward Collection, University of Rochester. 



No. 187. Ammonites Batesii, Thrash. 



This is a very typical species of the California Cretaceous. 

 wood Creek, Shasta Co., California 



From Cotton- 



No. 188. Ammonites bifrons, Bruguiere 

 (A. Walcotii, Sow). 



This species is characteristic of the lower 

 portion of the Upper Lias, and belongs to 

 Von Buch's Group "Falciferi." The speci- 

 men is from the L^pper Lias, Whitby, Eng- 

 land. 



No. 189. [473, Cast]. Ammonites bisulcatus, Brug. 



This Ammonite is frequently known by 

 Sowerby's name of A. Bucklandi. It is the 

 type of the group, " Arietes" of Von Buch. 

 From the Lower Lias, Rautenberg, Bruns- 

 wick. Diameter, 18 in. 



