209 
times single radii between the pairs; the tubercles art 
placed near the inner part of each whorl. 
A pyritaceous cast from Bramerton in Norfolk . 
AMMONITES ellipticus* 
TAB. XCI L-^Fig. 4. 
Spec. Ghar. Involute,, depressed, carinated; inner 
volutions two-thirds exposed; radii broad, 
slightly curved, few, obscure near the margin; 
aperture acutely elliptical; keel sharp. 
The regular elliptical form of the aperture is a strong 
character of this shell ; the obtuse radii are distant and 
correspond with the septa in number. 
My esteemed Friend, James Brodie, Esq. brought me 
this pyritaceous cast of an Ammonite, with other curiosities, 
from Charmouth : It was found among the marley clay of 
that place, so celebrated for various and numerous produc- 
tions ; I myself saw an imperfect impression of an Ammonite 
there, some years since, which was above a yard in diameter 
in a stone on the shore, but I do not remember the species. 
The remains of Crocodiles (as they have been commonly 
thought) consisting of teeth, jaws, vertebra, &c. show the 
place to have been an extraordinary deposit continually 
discovered by becoming again a prey to the sea, which 
seems once to have formed it, although no such things ar@ 
now found in a recent state. 
