24 
TAB. CCCCXXl.-^. 3. 
AMMONITES cristatus. 
Spec. Char. Lenticular, flattened, carinated ; 
keel thin, deeply notched; inner whorls 
concealed. 
Syn. Ammonites cristatus, Defiance, MSS . 
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 J ura as I learn from M. Defrance’s col- 
lection. 
