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ART. XXI. — On the Gaducibranchiale Uwodele Batrachians.' 

 . By Edw. Hallowell, M. D. 



CHARACTERS OF THE SUB- FAMILIES. 



SALAMANDRID^. 



Longitudinal teeth in an undulating series, each in a process of the inner and 

 posterior margin of the elongated vomerine bone. Tongue rather deep, attached in 

 front and posteriorly, free at the sides ; no bony bridge above the orbit ; ribs rudi- 

 mentary ; parotids very conspicuous ; a double series of pores along the median line 

 of the back and tail ; a lateral series of porous protuberances on each side ; tail round ; 

 habits terrestrial. 3 sp. 



SEIRANOTID,E. 



Palatine teeth in two longitudinal rows in the form of a Y reversed ; tongue well 

 developed, oblong, rounded in front, broader and almost truncate posteriorly, free in 

 its posterior half, less so laterally, attached in front ; no parotids ; four fingers and 

 four toes free; tail slender, long, with a ridge above and below, and also laterally, 

 more or less compressed toward the top ; ribs well developed. 



Remarks. — Differs from Tritonidce especially in the form of the tail, conformation 

 of the ribs, and tongue, which is bound down posteriorly in Tritonidos. 1 sp. 



PLEURODELID.E. 



Head depressed, tongue small, subcircular, free posteriorly and at the sides, attached 

 in front ; palatine teeth in two longitudinal series, nearly touching anteriorly, diverg- 

 ing posteriorly ; a bony arch above the orbit ; no distinct parotids ; extremities as 

 well as fingers and toes slender ; tail compressed ; a line of small pores on each side, 

 between the axilla and groin ; 14 ribs on each side, pointed at the extremity, some- 

 times perforating the skin ; habits aquatic. 



Remarks. — Related to the Tritons ; differs from them, chiefly in the length of the 

 ribs, in the tongue being free posteriorly, and smaller comparatively ; in the com- 



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