﻿338 HALLOWELL ON THE 



paratively larger and depressed head, and long and slender fingers and toes. Two 

 genera. Pleurodeles and Bradybates. 



PLETHODONTID.E. 



Two patches of vomerine teeth behind the internal nares, converging toward each 

 other, but separated by an interval ; two longitudinal rows of thickly set sphenoidal 

 teeth, commencing a little behind the palatine, and very closely approximated ; tongue 

 broad, oval, well developed ; free at its lateral edges, and posteriorly, attached in 

 front ; no parotids ; body cylindrical, extremities slender ; tail rounded, tapering to a 

 point; habits terrestrial. 2 genera. Plethodon,Aneides.-4:8$. 



BOLITOGLOSSID^E. 



Head short, flattened, eyes more or less prominent ; tongue of moderate size, mush- 

 room shaped, supported by a central pedicle ; two rows of vomerine teeth, one on each 

 side, immediately behind the inner margin of the internal nares, and two rows of 

 longitudinal sphenoidal teeth, each consisting of a double series, and separated from 

 the first by an interspace without teeth, or continuous with them, and from each 

 other by a well marked interval posteriorly ; body slender, cylindriform ; skin smooth ; 

 no parotids, or lateral pores ; extremities slender ; toes free, or one more or less 

 palmated. Four gen. : Spelerpes, Kaf,, Peseudotriton, Tsch., (Mycetoglossus, Bib.,) 

 Am.. Batrachroseps, (Am. and Europ.,) Geotriton, Bonap., (Europ.) 4 sp. (3 Am., 1 

 Europ.) 



AMBYSTOMID^E. 



Head large, convex, palatine teeth in a transverse row across the palate, either 

 straight or more or less angular, tongue ovate, moderately free at edges, slightly so in 

 front, attached posteriorly ; no sphenoidal teeth ; tail more or less compressed. 3 gen. : 

 Ambystoma, Xiphosoma, (Am.,) Onychodaciylus, (As.) 13 sp. 



TRITONID^]. 



Tongue fleshy, papillose, well developed, attached in front and behind, free at the 

 edges ; palatine teeth in two longitudinal series, approximated and almost parallel, 

 ( Cristatus, Europ.,) or closely in contact in front, diverging posteriorly, (Diemyctylus, 

 Am.,) so as to leave a triangular interspace; no trace of transverse vomerine teeth; 

 in some genera a bony bridge above the orbit, [Euproctus, Diemyctylus) ; no inter- 

 maxillary bone as in Salamandra, (Meckel) ; body smooth or granular ; head smaller 

 than middle portion of body ; tail compressed ; ribs rudimentary. 4 gen. : Euproctus, 

 (Europ.,) Taricha, Gray, (Am.,) Triton, (Europ.,) Diemyctylus, (Am.) 



