Branchice in the young Caeciliaj. 361 



from irpwroq and ne\.o<i ; still, in preference to this last appel- 

 lation, I propose the name of AmpJdbichthys, derived from 

 a/jL(f)i^Lo<i and fy^dv<i, for this new genus ; because it is, of all 

 the Amphibia, that which retains the most fish-like or ichthyic 

 characters, and is, in fact, intermediate between those two 

 classes. 



But it is necessary, for the reception of this new genus — 

 a type also of a new family— in the Order III. Manenti- 

 branchia of my Branchial Classification, to divide it into two 

 groups or tribes, because the gills in the Amphibichthys differ 

 in being merely fimbr ice or fringes concealed ivithin the bran- 

 chial apertures like those in most Fishes, and are not ramified 

 or tufted, and externally persistent, as in the Siren or Proteus ; 

 wherefore the former tribe I distinguish by the appellation of 

 Fimbribranchia, and the latter by that of Ramibranchia. 



Here, then, I subjoin my Classification of the Amphibia 

 founded upon the organs of respiration, as modified and ex- 

 tended in the manner I have already explained. 



Division I. Vertebrata. 

 Class IV. Amphibia. 



Sub-Class I. MoNOPXEUMENA. Respiring singly, either by gills 

 only, or by lungs alone. 

 Older I. Caducibrauchia. Gills decaying. 

 Tribe I. Celatibranchia. Gill-fringes concealed. 

 Family I. Caciliadee. Body lengthened, slender, snake-like; skin smooth, 

 wrinkled, mostly ■with minute scales ; tail extremely short ; legs none. 

 Genus : CcecUia. 



Tribe II. Prolatibranchia. Gill-tufts exjmsed. 

 Famil)'^ I. Ranidce. Adult body slender, oval; skin smooth or gi-anu- 

 lated ; tail none ; legs four ; tongue long ; teeth minute, fine ; tym- 

 panum open. 

 Genera : Rana, Ceratophrys, Hyla. 



Family II. BufonidcB. Adult body short, roundish, thick, frog-like; skin 

 tuberculated : tail wanting; legs four; tongue long; teeth none; tym- 

 panum open. 

 Genera ; Bitfo, Rhinella, Ot'dopha. 



Family III. DaclylethridcB. Adult body sliort, sometimes oval, frog-like ; 

 skin smooth or tuberculated ; tail none ; legs four ; tongue wanting or 

 distinct; teeth minute or partly absent ; tympanum hid. 



Genera: Dactyleihra, Bombinator, By-evicejJs. 



Family IV. AstrodactyUdcp. Adult body short, flat, frog like, tailless; 

 skin with tubercles ; legs four ; tongue wanting ; teeth none ; tympa- 

 num hid. 



Genus : Astrodactylns (Pipa). 



Family V. Salamandridce. Adult body long, lizard-like ; tail long, round 

 or compressed ; tympanum none ; legs four. 



Genera : Salamandra, Salamandrina, Molge, Triton. 



