4 REPTILES 



Order I. Rhynchocephalia — Tuatera. 



II. Crocodilia — Crocodiles, alligators, etc. 



III. Chelonia — Tortoises and turtles. 



IV. Squamata. 



Suborder I. Rhiptoglossa — Chameleons. 



2. Lacertilia — Lizards. 



3. Ophidia — Snakes. 



When, however, extinct types are also taken into considera- 

 tion, the list becomes greatly extended, and we have the follow- 

 ing orders of leading groups, viz. : — 



Subclass I. Theromorpha — Mammal-like brigade. 

 Order I. PaYiasauria. 

 II. Cotylosauria. 

 III. Anomodontia. 

 Subclass II. Ornithomorpha— Bird-like brigade. 

 Order IV. Rhynchocephalia — Tuateras. 

 V. Pelycosauria. 

 VI. Parasuchia — Belodonts. 

 VII. Acrosauria. 

 VIII. Squamata — Lizards and snakes. 



Suborder 1. Rhiptoglossa — Chameleons. 



2. Lacertilia — Lizards. 



3. Pythonomorpha — Sea-ser- 



pents. 



4. Dolichosauria — Snake-liz- 



ards. 



5. Ophidia — Snakes. 

 IX. Chelonia — Tortoises and turtles. 



X. Placodontia — Bean-toothed reptiles. 

 XL Sauropterygia — Plesiosaurs. 

 XII. Ichthyopterygia — Ichthyosaurs. 



XIII. Crocodilia — Crocodiles. 



XIV. Dinosauria — Giant reptiles. 

 XV. Ornithosauria — Pterodactyles. 



It should be mentioned that a somewhat different arrange- 

 ment of the two main divisions of reptiles has been proposed ; 

 some authorities including within the first brigade (under the 

 name of Synapsida) the Chelonia and Sauropterygia, on the 

 ground that they agree with the Theromorpha in possessing 

 single or united temporal arches, and including in the second 



