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AMMONITES Lamberti. 
TAR CCXLIL— Fig. l, 2, and 3. 
Spec. Char. Discoid, depressed, radiated ; inner 
whorles partly concealed ; radii numerous, bent 
forward over the front, alternately long’ and 
short, rarely furcated ; front sharp, crenated ; 
mouth lanceolate, short. 
The longer radii are strong obtuse ridges that proceed 
from the inner margin of each whorle and a little way 
beyond the middle are curved forward, sometimes they 
branch at this part, but generally the shorter ridges com- 
mence here and accompany them over the edge, where 
they produce an imperfect crenulated keel ; in some 
specimens there are two or even three short radii between 
each long one, and in some the radii are much more ele- 
vated than in others, particularly in the last turn of large 
ones, where they are also proportionally less numerous. 
The diameter is nearly four times the thickness. 
From Portland and Weymouth. Named after Aylmer 
Bourke Lambert, Esq. V. P. L. S. &c. 
AMMONITES Leachi. 
TAB. CCXLIL —Fig. 4. 
Spec. Char. Depressed, radiated ; inner whorles 
half concealed ; radii undulated and curved 
forward over the front, often furcated ; front 
sharp, crenated ; mouth ovate. 
This differs from the last only in being more gibbose, 
and having fewer and more prominent radii ; it is pos- 
sibly only a variety. 
From Weymouth. I have joined Dr. W. E. Leach’s 
name to this Ammonite, as a further mark of that re- 
spect already paid so often to his abilities. 
