Branchim in the young Caeciliae. 361 



from 7rp(OTo<; and fteXo? ; stilly in preference to this last appel- 

 lation, I propose the name of AmjMbichthys, derived from 

 ajjL(j)L^oo(; and t%^f 9, 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 fimbria or fringes concealed within 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. MoNOPNEUMENA. Respiring singly, either by gills 

 only, or by lungs alone. 

 Older I. Caducibranchia. Gills decaying. 

 Tribe I. Celatibranehia. Gill-fringes concealed. 

 Family I. C<sciliadce. Body lengthened, slender, snake-like ; skin smooth, 

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

 Genus : Ccecllia. 



Tribe II. Prolatibranchia. Gill-tufts exposed. 

 Family I. Ranidce. Adult body slender, oval ; skin smooth or granu- 

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

 panum open. 

 Genera : Rana, Ceratophrys, Hi/la. 



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

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

 panum open. 

 Cienera : Bufo, Rhinella, Otilopha. 



Family III. DactylethridcB. Adult body short, sometimes oval, frog-like ; 

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

 distinct ; teeth minute or partly absent ; tympanum hid. 

 Genera : Dactyleilira^ Bombinator, Breviceps. 



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

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

 num hid. 

 Genus : Astrodactylus (Pipa). 

 Family V. Salamandr'idcc. Adult body long, lizard-like ; tail long, round 



or compressed ; tympanum none ; legs four. 

 Genera : Salamandra, Sala7iiandrina, MolgCy I'riton. 



