98 



MOLLUSCA. 



No. 190. [475, Cast]. Ammonites Blagdeni, Sow. 



This fine specimen closely resembles A, 

 coronatus, and belongs to the same group, 

 " Goronati." It is from the Lower Oolite, 

 Dorsetshire, England, and now in the Ward 

 Collection, University of Rochester. 



Diameter, 7. 



No. 191. [476, Cast], Ammonites Birchii, Sow. 



This elegant form, with the outer mark- 

 ings of the shell visible upon all its whorls, 

 and a double row of spines, belongs to the 

 group " Armati." It is from the Lower 

 Lias, Charmouth, England, and belongs 

 to the Ward Collection, University of 

 Rochester. 



Diameter, 8. 



No. 193. [478, CastJ. Ammonites Brongniarti, Sow. 



This curiously inflated species is from the Lower Oolite, Yeovil, England. 



Diameter 10. 



No. 193. [479, Cast]. Ammonites concavus, Sow. 



This species belongs to the group "Disci." 

 From the Lower Oolite, Bridport, England, and 

 now in the Ward Collection, University of Roch- 

 ester. 



No. 194. Ammonites complanatus, Brus 

 From the Upper Lias, Millan, France. 



No. 195. [481, Cast]. Ammonites Comptoni, Pratt. 



This species is closely allied to the well- 

 known A. Jason, but it is distinguished from 

 it by wanting the spines which ornament that 

 species. Like it, it has long, narrow, lateral 

 processes extending from the lip of the shell. 

 It is associated with A. Jason in the Oxford 

 Clay (Middle Oolite), Christian Malford, Eng- 

 land. 



