STEUCTUEE OF EEPTILES AND AMPHIBIANS. 
27 
and limb-bones to the bony shell. Lizards and Snakes are 
mostly represented by coloured casts. The extinct Dinosaurs 
are represented by a small-sized model of the Iguanodon, 
together with a photograph of the skeleton and a plaster-cast 
of the bones of the hind-foot showing the three toes. 
The adjacent side of the table-case shows the modifications 
of the backbone, or vertebral column, of the ribs, and of the 
B C 
Fig. 8. — Skull of the C4iant Tuatera (Eyperodapedon gordoni), from the 
Triassic Sandstone of Lossiemouth, Elgin, nat. size). A. upper surface 
of skull; B, palatal aspect of skull; C, under-side of front of lower 
jaw ; Pmx, premaxillary bone ; 3Ix, maxillary ; PI, palatal teeth ; 
Md, lower jaw; 0, orbit, or eye-socket-; N, Eostrils; temporal pit; 
;S", lateral temporal fossa. 
limbs, in the different groups of the class. Specially noticeable 
are examples of five types of Skink-like Lizards, exhibiting the 
gradual diminution in the size of the limbs and their final 
disappearance. 
The opposite, or north, side of the table-case displays the 
