GUIDE TO EEPTILES AND AMPHIBIANS. 



CLASSIFICATION OF REPTILIA— continued. 



IV. Rhynchocephalia 

 (Tuateras.) 



Sub-order 



1. fProtorosauria . 



2. Rhynchocephalia Vera 



3. fAcrosauria 



V. fPELYCOSAURIA 



i 1. Ophidia 

 VT „ I 2. Lacertilia 



(Snakes and Lizards.) ' 



VII. flCHTHYOPTEEYGIA 



(Ichthyosaurs.) 



VIII. Chelonia 



(Tortoises and Turtles.) 



4. fDolichosauria 



5. fPythonomorpha 



1. Athecse . 



2. Cryptodira . 



3. Pleurodira . 



4. fAmphichelydia 



5. Trionychoidia . 



IX. fSAUEOPTERYGIA 



y (Pleriosaurs.) 



[fPLACODONTIA] 



A a 



X. fTHEROMORPHA 



(Anomodonts.) 



Of uncertain position 



1. Dicynodontia . 



2. Theriodontia . 



3. Cotylosauria . 



4. Pariasauria . . 



11-20 



17 



6-10 



1G 



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— ORNITHOSAUBIA (extinct). 



(Case 4.) 



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

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

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



