CLASS A.MI'IHHTA 511 



Family PROTEID.E. - With characters of the suborder. 



Examples: Xeclurus, 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. SALAMANDRID.E, 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), 



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.E. -- 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; 



