26 
telli (tab. 176.) ; when they are large it comes still nearer 
to A. Hippocastanum, which may possibly be only a re- 
markable variety of it. Mr. Mantell observes, “ it varies 
from a few inches to a foot in diameter.” 
Very abundant, but less so than A. varians (tab. 55.), 
in the lowest Chalk and Chalk Marl of Sussex, Wilt- 
shire, &c., as at Hamsey, Bidcomb, and Rouen. 
It is an unfortunate circumstance that two names 
should have been given to this Ammonite from its loca- 
lities, and proves the impropriety of such names for fos- 
sils ; — we retain that which we suppose to be the oldest. 
