166 
AMMONITES tetrammata. 
TAB. DLXXXVII.—fig. 2. 
Spec. Cuar. Discoid, carinated, tuberculated ; vo- 
lutions about four, convex, crossed by many 
obscure rays, upon each of which are four tu- 
bercles, each alternate ray has a branch with 
two tubercles ; outer tubercles compressed ; 
keel entire, sharp. 
i 
Tus Ammonite, as far as we at present know, varies 
but little in its different stages of growth. It bearsa 
great resemblance to some of the forms of A. varians 
(t. 176.), but is a larger shell; and the four rows, instead 
of three, of tubercles distinguish it. 
We received a specimen of this many years ago from 
our kind friend G. A. Mantell, Esq. It is rather less 
than the one figured, which is in the cabinet of H. H. 
Goodhall, Esq., who found it at Hamsey*, and pointed it . 
out as anew species. The specimen sent by Mr. Man- 
tell was obtained in the same parish. 
* From a pit in the road from Lewes towards Ditchling. 
