170 
l. 
abundance. Some of the specimens figured are from 
Wiltshire, others from Sussex. I am indebted to 
many friends for varieties from the former county : 
G. A. Mantell, Esq. has kindly communicated a good 
suite from Hamsey, Plumpton, and other parts of the 
south of Sussex. 
AMMONITES inflatus. 
TAB. CLXXVIII. 
Spec. Char. Depressed, radiated, carinated ; 
sides and front flattish ; inner whorls exposed ; 
the latter whorl inflated near the aperture ; 
radii commencing with a tubercle, then fur- 
cated ; keel distinct, entire ; aperture square. 
W hether this is a distorted cast may remain a question, 
as it does not appear to be fractured in any part; its ellip- 
tical form leads to suspicion. The sudden increase of the 
last volution near the end, and subsequent contraction, 
is a curious circumstance, if it be constant, and it can 
hardly be the effect of pressure in any direction. The 
undulations or rather radii are large, commencing with 
a compressed tubercle, then furcate, one of the branches 
being sometimes divided from the other, ending in elon- 
gated compressed knobs upon the front. 
A cast in the green sand of the under cliff in the Isle of 
Wight, lent me by the Rev. William Buckland ; the 
lower figure is a fore-shortened view of the same 
specimen. 
