CLASSIFICATIONS OF THE AMPHIBIA. 269 



Ordo VIII. — Ichthyodi. 



Familia 1. Hedrceoglossi. 



Tribus 1 . Branchiis nullis. 



Genera. — Menopoma. Amphiuma. 



Tribus 2. Branchiis distinctis. 



Genera. — Siredon. Proteus. Menobranchus. Siren. 



Some of the genera above given are not those of Wagler, 

 but they are here introduced to avoid an unnecessary increase 

 of synonymes. The families are characterised by the tongue; 

 and the other characters are, the absence and presence of a 

 tail, and of gills. The name of the last order is taken from 

 . Latreille. 



In his ' Synopsis of the Species of the Class Reptilia? ap- 

 pended to the 9th vol. of Cuvier's ' Animal Kingdom,' trans- 

 lated by E. Griffith, 1831, Mr. Gray has adopted Merrem's 

 two tribes, under which he has arranged the following genera. 



AMPHIBIA. 



Section I. Mutabilia. — Undergoing a transformation. Gills deciduous, 

 covered with a deciduous operculum. 



Genera. — Rana. Ceratophrys. Hyla. Bufo. Rhinella. Otilopha. 

 Dactylethra. Bombinator. Breviceps. Pipa. Salamandrina. Salaman- 

 dra. Molge. 



Section II. Amphipneusta. — Not undergoing transformation. 



Genera. — Proteus. Menobranchus. Siredon. Siren. Pseudobranchus. 

 Menopoma. Amphiuma. Ccecilia. 



With regard to the next classification, Professor Bell ob- 

 serves, — " it appears to me that no one arrangement hitherto 

 given sufficiently distinguishes the different forms; and I ven- 

 ture to propose the following modifications, as more consist- 

 ent with the diversities of structure in the different groups." 



Class.— AMPHIBIA. 



Order 1. Amphipneusta. Genera. — Proteus. Siredon. Menobran- 

 chus Siren. Pseudobranchus. 



Order 2. Anoura. Genera. — Rana. Hyla. Ceratophrys. Bufo. Rhi- 

 nella. Otilopha. Dactylethra. Bombinator. Breviceps. 



Order 3. Urodela. Genera. — Salamandrina. Salamandra. Molge. 



Order 4. Abranchia. Genera. — Menopoma. Amphiuma. 



Order 5. Apoda. Genus. — Ccecilia. 



This arrangement comprehending, 1st, the manner of 

 breathing ; 2ndly, the absence of a tail in the adults ; 3rdly, 

 the presence of a long tail ; 4thly, the ivant of gills ; and 



