100 
as they diverge from the centre they turn a little forward, 
then bend suddenly back, and afterwards proceed in 
regular semicircles to the margin, somewhat resembling 
the curve of a reaping hook. The inner edge of the 
turns is elevated and obtuse. 
This nearly resembles the last, but is not so flat, and 
wants the flat surface of the inner margin of the whorle. 
It is from the Inferior or Iron-shot Oolite of Ilminster. 
AMMONITES GoodhallL 
TAB. CCLV. 
Spec. Char. Discoid, carinated, radiated ; inner 
turns two- thirds exposed ; radii large, undula- 
ted, irregular, obscurely tuberculated at each 
end ; keel very prominent, thin ; aperture 
oblong. 
B oth edges of the whorles of this Ammonite are gra- 
dually rounded ; the sides nearly flat. Between the 
principal radii are sometimes shorter ones, the first 
have an elevation at each end forming a kind of tuber- 
cle, the latter have tubercles at the outer ends only, none 
of the radii are very prominent, although they are broad. 
The length of the aperture equals about two-fifths of the 
diameter. 
The specimen here exhibited is a calcedonic cast in 
micacious Sandstone, from Black down, Devonshire ; 
it was given me by H. H. Goodhall, Esq. in comme- 
moration of whose long continued researches we have 
named it. 
