24 



TAB. CCCCXXi.—Jig. 3. 

 AMMONITES cristatus. 



Spec. Char. Lenticular, flattened, carinated ; 



keel thin, deeply notched ; inner whorls 



concealed. 

 Syn. Ammonites cristatus, Def ranee, 3ISS. 



The thin deeply notched keel of this Ammonite distin- 

 guishes it from every other. 



Found near Weymouth by Mr. Bryer, who kindly 

 placed it in Mr. Sowerby*s collection many years ago ; 

 it is a cast in Pyrites ; similar specimens have been 

 found on Mount Jura as I learn from M. Defrance's col- 

 lection . 



