90 
Faujas St. Ford, (Hist. Nat. de Maestricht, t. 24 , f. 1) 
as a Gryphite. It appears to be a species common to the 
green Sand and the strata between it and the Chalk, 
and will serve to identify that range ; while the O. gre- 
garea, which is a less curved and much more irregular 
shell, distinguishes the Pisolite. 
