CHALK FOSSILS. 
95 
the strata, as before observed, were formed at tlie 
bottom of a profound ocean. The abundance of 
tiie Ammonites, Hamites, Turrilites, Nautili, 
and other chambered sliells (at once the habitations 
and swimming apparatus of the mollusca to which 
they belonged), confirms this conclusion. The 
Belemnites, Echini, TerebratuUr, Plagiostoma, 
Inocerami, Spongiic, Alcyonia, and other related 
zoophytes ; Caryophyllea*, Turbinolue, and other 
sim})le stellular corals ; Marsupites, and a few of 
the Crinoidese, compose the principal, fossil re- 
mains of the popnlation of the once extensive ocean 
of the chalk. The species already ascertained in 
the iipjier and lower chalk exceed 300 ; those 
from the Sussex beds are enumerated in the tabular 
arrangement at the end of this volume ; and we 
shall only notice, in a cursory manner, in this place, 
the most interesting of the organic remains that 
have been discovered in the chalk of the South- 
East of England. 
VEGETABLE REMAINS. 
Of marine plants, traces of Con fervcp^ and Fuci^ 
occur in the lower chalk ; a specimen of Confer- 
vifes fasciciilata (of M. Adolphe Brongniart) has 
been noticed in dint; and a fine species of Fucus 
in chalk, which I have named in honour of the 
distinguished author of the Vegetaux Fossiles, 
Fucoides Brongniarti. 
