36 THE VERTEBRATE SKELETON. 



Order 4. ANURA. 

 Suborder (1). AGLOSSA. 

 Family Xenopidae. Xenopus. 

 Family Pipidae. Pipa Surinam toad. 



Suborder (2). PHANEROGLOSSA. 



Group ARCIFERA. 

 Family Discoglossidae. Discoglossus painted frog. 



Bombinator fire-bellied frog. 

 Alytes midwife frog. 



Family Pelobatidae. Pelobates toad frog. 

 Family Hylidae. Hyla green tree-frog. 

 Family Bufonidae. Bufo toad. 



Docidophryne. 

 Family Cystignathidae. Ceratophrys horned frog. 



Group FlRMISTERNIA. 



Family Ranidae. Rana common and edible frogs. 

 Family Engystomatidae. Brachycephalus. 



B. SAUROPSIDA. 



CLASS I. REPTILIA 1 . 



Order 1. THEROMORPHA. 



Group Anomodontia. Dicynodon. 



Udenodon. 



Group Placodontia. Placodus. 

 Group Pariasamia. Pariasaurus. 



Elginia. 



Group Theriodontia. Dimetrodon. 

 Galesaurus. 

 Cynognathus. 



1 This classification of reptiles is mainly based on that of Lydekker 

 (Catalogue of Fossil Reptiles in the British Museum) but in some respects 

 that of von Zittel has been followed. 



