GUIDE TO EEPTILES AND AMPHIBIANS. 



CLASSIFICATION OF HEFTILI A^continued. 



Order. Sub-order Cask. 



IV. Ehynchocephalia . . 2. Rhynchocephalia Vera 



V ^ I 3 + Arrnsanria, 



3. t-'^crosauria 



V. fPELYCOSAUBIA 



II. Ophidia \ 

 2. Lacertilia I 

 3. Rhiptogilossa .... 11-20 

 4. tDolichosauria • • • 

 5. fPythonomorpha . . . } 



VII. flCHTHYOPTERYGIA • • | yj 



(Ichthyosaurs.) J 



II. Athecse 'n 

 3' Pleurodira I 6-10 

 4: tAmphicbelydia '. '. '. 

 5. Trionychoidia .... J 



IX. tSAUROPTERYGIA . 



L (Pleriosaurs.) 



16 



S CO \ 



5pq I 



[jPlacodontia] ... Of uncertain position 



II. Dicynodontia . 



2. Theriodontia . 



3. Cotylosauria . 

 4. Pariasauria 



In the gallery the larger specimens are arranged either on stands 

 or in table-cases, and the rest in the wall-cases. Owing to differences 

 in the sizes of the wall-cases, it has not, however, been found possible 

 to make the serial arrangement of the various groups correspond 

 exactly with the one adopted in this guide. 



The following is a brief survey of the leading characteristics of 

 the different orders and sub-orders of reptiles, and also of the more 

 important family groups by which existing orders and sub-orders are 

 represented. 



Order L— OENITHOSAUEIA {extincf). 

 (Case 4.) 



Pterodactyles, as the members of this extinct order are called, 

 flourished during the Mesozoic, or Secondary, epoch, and are dis- 

 tinguished by the modification of the fore-hmbs into wings, the 



