THE VPSILOID APPARATUS OF URODELES. 



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apparatus, together with a general description of body form 

 and habits : l 



A comparison of the facts given in this tabulated form shows 

 that the following classifications may be made : 



1. Forms with lungs and ypsiloid apparatus Axolotl, Cryp- 

 tobranchus. 



2. Forms with lungs but without an ypsiloid apparatus - 

 Siren, Nee turns, Proteus, Amphiuma. 



3. Forms with neither lungs nor ypsiloid apparatus- - Typh- 

 lomrtge. Of the first group it may be said that since Axolotl is 

 a larval form of a salamander which has lungs and an ypsiloid 

 apparatus, its condition is exactly what one would expect to find 



1 The statement of facts relating to thi habits of these forms is the result of my 

 own observation only in the case of Necturus and Amphiuma. In other cases the in- 

 formation has been derived from various scientific works. 



2 Miss Emerson (1905) has shown valid reasons for regarding Typhlomolge the 

 permanent larval form of one of the Plethodontidtz. 



