CLASS AMPHIBIA 511 



Family PROTEID^E. With characters of the suborder. 



Examples: Necturus, Proteus, Typhlomolge. 

 Suborder 2. MEANTES (Fam. SIRENIDAE, Fig. 429). SIRENS. 

 -Tailed AMPHIBIA without hind limbs; three pairs of 

 external gills and three pairs of gill-openings persistent; 

 no eyelids. 



Family SIRENID^E. With the characters of the suborder. 



Examples: Siren, Pseudobranchus. 



Suborder 3. MUTABILIA (Fam. SALAMANDRIM, Figs. 430- 

 433). SALAMANDERS. Tailed AMPHIBIA with two 

 pairs of limbs; without gills and generally without 

 gill-openings in adult ; usually with movable eye- 

 lids. 



Superfamily i. AMPHIUMOIDE.E. MUTABILIA with two 

 pairs of small limbs; sometimes one pair of gill-open- 

 ings; vertebrae amphiccelous ; without eyelids. 



Family CRYPTOBRANCHIP^E. With the characters of the 

 superfamily. Examples: Cryptobranchus (Fig. 430), 

 Amphiuma. 



Superfamily 2. SALAMANDROIDE.E. MUTABILIA with- 

 out gills or gill-openings in the adult; with movable 

 eyelids; vertebrae usually opisthoccelous. The families 

 are distinguished from one another principally by the 

 position of the teeth and the number of toes. 



Family i. SALAMANDRID^:. Examples: Salamandra, 

 Triton (Fig. 431), Diemyctylus. 



Family 2. AMBYSTOMID.E. Examples: Ambystoma (Fig. 

 432), Chondrotus. 



Family 3. PLETHODONTID^E. Examples: Plethodon, Spe- 



lerpes, Desmognathus (Fig. 433). 



Order 3. Salientia (ANURA, Figs. 434-436). TAILLESS AM- 

 PHIBIA. AMPHIBIA without a tail ; without scales ; two 

 pairs of limbs; without external gills or gill-openings in 

 adult. 

 Suborder i. AGLOSSA. SALIENTIA without a tongue; 



