4 
Crocodiles. 
Pterodae- 
tyles. 
Wall-case, 
No. 1. 
Table-case, 
No. 1. 
Crocodiles. 
Wall-case, 
No. 2, and 
Table-cases 
Nos. 2 to 7. 
Pteranodon, had no teeth in 
its jaws, which were a yard 
in length, sharp-edged and 
pointed, and were probably 
encased in a horny sheath 
like the beak of a stork or 
heron ( see Fig. 4). ^ 
The Flying Lizards of s 
the Chalk and Greensand 
attained even a larger size b 
— but their remains are all e* 
very fragmentary. For exam- g 
pie, some detached vertebrae of a 
the neck of one species have s | 
been found in the Cambridge fj| 
Greensand, measuring 2 in- g | 
dies in length, and portions g 5 
of humeri 3 inches broad. v| 
Such bones give evidence of *1 
a flying lizard having pro- £ | 
bably an expanse of wings |3 
of from 18 to 20 feet. The 2 | 
Pterodactyles of the Chalk ^ 
of Kent were nearly, if not g.r 
quite, as large. r | 
The smallest species of g, 
Pterodactyle fromSolenliofen g 
was not larger than a sparrow £ 
(see Table-case No. 1). These <g. 
singular flying reptiles do not 
appear to have lived longer | 
than the period of time repre- r 
sented by the deposition of 
the strata from the Lias 
formation to the Chalk, their 
remains being confined to 
rocks of the Secondary, or 
Mesozoic age. They are now 
entirely extinct. 
Order II. — CROCODILIA. (Crocodiles.) 
The Crocodilia (which are placed in Wall -case No. 2, and 
in Table-cases Nos. 2-7) have the body covered with a thick 
layer of oblong bony plates or scutes, pitted on the surface, 
and covered with a horny substance. They have a single row 
of pointed and subconical or laterally compressed teeth in 
