FROM THE LIAS. 
121 
Case. Shelf. 
87 d 
d 
87 e 
e 
e 
e 
e 
No. 
1 crushed skull of Plesiosaurus macropterus 
(Seeley), belonging to the skeleton in the 
Lecture-room, Compartment A. 
2—3 cranial region of a large and undescribed 
Teleosaur, from the Lias of Whitby. It 
corresponds closely with the cerebral part 
of a Plesiosaur head. It has been sawn 
through to show the brain cavity, in which 
may be distinguished cerebral lobes, optic 
lobes, and cerebellum, also olfactory and 
optic nerves. It differs much from Cro¬ 
codiles, and makes some approach to ser¬ 
pents and turtles, and probably differs but 
little from the brain of a Plesiosaur. Te- 
leosaurs make so many approximations to 
Plesiosaurs, as to show that they form a 
group of Crocodiles of equal value with 
the Crocodiles now living. 
1 anchylosed atlas and axis of Plesiosaurus 
megadeirus, from the Rimeridge Clay of 
Ely, presented by Stead Jones, Esq. 
2 anchylosed atlas and axis of Plesiosaurus 
megadeirus, from the Rimeridge Clay near 
Haddenham, presented by the Rev. S. 
Banks, M.A. It is sawn in halves to 
show the union between the bones. 
3 separated atlas and axis of Plesiosaurus eleu- 
theraxion (Seeley), from the skeleton in 
the Lecture-room. Presented by T. Haw¬ 
kins, Esq. They were figured by Mr Lucas 
Barrett in the Annals of Natural History 
for November 1858. 
4 anchylosed atlas and axis of a small Ichthyo¬ 
saur from the Lias, sawn through to show 
the union between the bones. 
5 anchylosed atlas and axis of a small Ich¬ 
thyosaur from the Lias, of a different 
