IO AMPHIBIA. 



etal plates, the following table gives the subdivisions of 

 this class into orders: 



Feet present at least in front ; body not vermiform, (a) 



Feet wanting ; body vermiform Ophiomorpha. 



(a) Adult tailless ; body thick Anoura. 



(a) Tail always present; body lacertiloicL — Urodela. 



URODELA. 



caudata, Leuckart. 



Body elongated, naked or without exoskeletal plates; 45 " 

 tail compressed or cylindrical, persistent throughout 

 life ; feet usually two pairs, rarely only one ; radius and 

 ulna, as well as tibia and fibula, not united into a single 

 piece; external opening of the cloaca a longitudinal slit. 



Gills persistent throughout life . Perennibranchiata. 



Gills caducousf Caducibranchiata. 



Perennibranchiata. 



Amphipneusta, Oppel; Proteides, Leuckart, Harlan. 

 Muller, Dumeril and Bibron ; Phanerobranches, Dumer- 



*Amphiuraa has very fine scales, and in this respect resembles 

 the Csecilians. 



fSee at least apparent exception in the case of Siredon. 



