CADUCIBRANCHIATA. 25 



with three phalanges; eyelids two, an upper and a low- 

 er, very distinct. 



Dummeril and Bibron contrasted the term Atretoderes 

 from Atratos without a foramen and deras neck 

 with Trematoderes, which they applied to the remainder 

 of the Anoura. The latter name etymologically consid- 

 ered seems to be a good one, but unnecessary, as is also 

 its synonym Immutabilia, of Fitzinger. 



In the subdivision of the Salamandrida various meth- 

 ods have been followed. Hallowell (31, h) recognizes 

 nine families, Cope (24, o), six, Dr. Gray (30, b) in his 

 Catalogue of the British Museum, five, while Prof. 

 Strauch w r ho has lately written " Revision der Salaman- 

 driden Gattungen," divides them into Mecodonta and 

 Lechriodonta, the former comprising those in which the 

 vomero-palatines are so arranged as to diverge posterior- 

 ly, and the latter those in which the same teeth show a 

 transverse arrangement, or converge behind. The char- 

 acters of Cope's families are given in the enclosed table. 

 The genera included by him under each family are as 

 follows: Amblystomidag — Amblystoma, Ensatina,* and 

 Onychodactylusf ; Plethodontidse — Plethodon, Hemidac- 

 tylium, Spelerpes, Geotriton, Batrachoseps, Anaides, 

 and the following genera given under other names : Her- 

 edia, Oedipus, Manculus, Thorius, Gymnophilus, Ophio- 

 batrachus ; Desmognathidae — Desmognathus^: ; Hynobii- 

 dae — Hynobius ; Salamandrida? — Salamandra and Tri- 



*^N"ow included in the genus Amblystoma. 



fHe at a later date was disposed to con 

 ) the Plethodontidse. 



{Equal to part of the genus Plethodon. 



fHe at a later date was disposed to consider this as belong-in- 

 to the PlethodontidaB. 



