114 
AMMONITES Brownl 
TAB. GCLXIII, Figs. 4 , and 5 . 
Sp. Char. Discoid., with radiating undulations 
inner whorles half exposed,, with large tu- 
bercles upon each side ; marginal undulations 
many., central ones few., rising into tuber- 
cles ; front rounded with a distinct keel ; 
aperture cordate. 
Jn general appearance very much like the last, but 
rather thicker and sufficiently distinguished by the keel 
and knobs upon the inner volutions. 
From Dundry, by favour of my good friend G. W. 
Braikenridge, Esq, I wish by the name of this Ammonite 
to commemorate R. Brown, Esq.: a gentleman of general 
knowledge, and an excellent Botanist. 
