CLASSIFICATION OF VERTEBRATA 13 



Trimerorhachis. Permian, Texas. 

 Archegosaurus. Lower Bed, Germany. 



Actinodon. ) T ^ ^ ^ 



vLower Eed, France. 

 Euchirosaurus.J 



3. Order Stereospondyli, Zittel. 



Trematosaurus. New Eed, Germany. 

 Capitosaurus. New Eed, Germany. 

 Mastodonsaurus. Trias, Germany, England/ 

 Labyrinthodon. Keuper, England. 



2. Sub-CLASS LISSAMPHIBIA, Haeckel 



Without bony dermal armour ; without supratemporalia, 

 supraoccipitalia, and postorbitalia. 



1. Order Urodela, Dume"ril. Pseudocentrous, with the tail 

 remaining throughout life. 



Normally with two pairs of limbs. Ilio-sacral attachment 

 acetabular. Skin naked and smooth. 



Periarctic, but extending into North-western South America. 

 Fossils unknown until the mid-Tertiary epoch. 

 Salamandridae. Without gills in the perfect state. Max- 

 illaries present. Both jaws toothed. Eyelids present. 

 Salamandra. Western palaearctic. 

 Chioglossa. Iberian peninsula. 

 Triton. Periarctic. 



Amblystoma. Numerous species in North America and 

 Mexico ; the larva or " Axolotl " has -been described as Siredon. 

 One species, A. persimile, from mountains of Siam. 

 Allied genera, e.g. Eanidens, Salamandrella in Japan, 

 Manchuria, Eastern Siberia. 



Plethodon. North America. 



Spelerpes. North America, Mexico, Columbia, Costa 



Eica, Hayti, and North Italy. 

 Desmognathus. North America. 



Amphiumidae. No gills in the perfect state, but with or 

 without a pair of gill-clefts. Maxillaries present. Both jaws 

 toothed. No eyelids. 



Cryptobranchus japonicus. Japan, China ; without 

 spiracle. Miocene, Europe : Andrias. 



