194 



YERTEBRATA. 



vertebrae). These include nine families, according to Glaus; while 

 Schmarda (1878), ignoring any higher divisions, has only five. 



ICIITHYODEA. 



Proteidce. 

 Siren. 

 Proteus. 

 Menobranchus. 



Menoporaa. 

 Cryptobranchus = 

 Sieboldia. 



SALAMANDRINA. 



AmblystomidcB. 



Cryptobranchida. Plethodon. 

 Amphiuma. Pectoglc 



Geotriton = Sperlepes. 

 Amblystoma. 



Salamandrida. 

 Triton (Eft, Newt). 

 Salamandra. 

 *Telerpeton. 



Order III. LABYKINTHODONTA. 

 ARCHEGOSAURIA. GANOCEPHALA. STEGOCEPHALA. 



Extinct amphibians, "with relatively weak limbs and a long 

 tail." Teeth conical, their structure complex. 



The body appears to have been defended by bony plates of 

 various sizes according to the parts on which they were placed. 

 The teeth were more or less indented by convoluted folds con- 

 verging towards the centre. 



The Labyrinthodonla were colossal animals of a salamandriform 

 type, living mostly in the Triassic period. Their footprints 

 afforded us the first indication of their having ever existed ; and 

 the unknown animal that made them, then supposed to be a 

 kangaroo, received from Kaup the provisional name of " Chiro- 

 therium." 



Three suborders or families are indicated Archegosauria, 

 Microsauria, and Mastodonsauria ; one of the genera (Archcgo- 

 saurus), it is suggested, may have been a larval form. Numerous 

 genera have been proposed ; the principal are : 



^Labyrinthodon. 



*Herpeton. 



*Dendrerpeton. 



Order IV. BATKACHIA. (Frogs and Toads.) 



BATEACIIIA SALIENTIA. ANURA. THERIOMORPHA. 



Tailless amphibians, breathing by lungs in the adult state. 



