XXX . — Notice of the discovery of a new Fossil Animal , forming a 
link between the Ichthyosaurus and Crocodile , together with general 
remarks on the Osteology of the Ichthyosaurus ; 
from the Observations of H. T. De la BECHE, Esq. f.r s. m.g.s. 
and 
The Rev. W. D. CONYBEARE, f.r.s. m.g.s. 
BRAWN UT> AND COMMUNICATED BY THE LATTER. 
[Read April 6, X821.} 
In the course of a series of observations on the organic remains 
contained in the lias in the vicinity of Bristol, my attention was par- 
ticularly attracted by the numerous vertebrae of oviparous quadrupeds 
occuring in that formation. Of these a considerable portion obviously 
belonged to the Ichthyosaurus ; the remaining, and larger division, 
presented vertebrae of forms considerably differing from each other^ 
but which, from some general analogies, I was persuaded had all 
belonged to different places in the vertebral column of a single 
species ; and I ventured even to point out those places, from a com- 
parison with those of the crocodile to which they bore a strong 
general resemblance, yet at the same time combined with so many 
material points of difference, as to prove that the animal from which 
they were derived must have constituted a separate genus. 
At this period, I was fortunate enough to associate in my re- 
searches a colleague equally able and zealous, whose name stands at 
Vol. V. 4 b 
