6l CADUCIBRANCHIATA. 



oval; muzzle truncate: nostrils -joined to the commissure 

 by a delicate furrow ; vomerine teeth eight, on an arched 

 ridge: outer nares farther apart than the inner: gular 

 fold prominent: costal furrows fourteen: bodv slender, 

 cylindrical : limbs appressed ; digits long and slim ; thumb 

 with a short phalanx, but not distinct. 

 Length 3.65 inches. Head to axilla .7 inch. 



Tail 1.65 " Breadth of head .28 " 



Habitat Oregon. 



Plethodon. Tschudi. 



Phatnomatorhina, Bibron ; Plethodon and Desmogna- 

 thus, Baird, Cope. 



I r omerine teeth in two -patches, one behind each of the 

 inner nares rarelv wanting: sphenoidale numerous in two 

 almost quadrilateral groups; tongue large, round, or 

 oval, entire or slightlv notched behind, adherent in front 

 and centrally, laterally and posteriorly free: skin smooth; 

 bodv cylindrical; tail round tapering to the tip: toes 

 four in front and jive behind; praemaxillaries two. 



With the exception of Plethedon persimilis, the exact 

 position of w T hich is doubtful, the following table will 

 serve for the determination of the species : 



Sphenoidal teeth in two medially contiguous groups ; 



