42 THE COAL MEASURES AMPHIBIA OF NORTH AMERICA. 



Huxley in 1869 proposed (335) the following classification, which does not differ 

 essentially from that proposed in 1 863 : 



AMPHIBIA. 



Order i. Urodela. 

 Order 2. Batrachia. 

 Order 3. Gymnophiona. 

 Order 4. Labyrinthodontia. 



Suborder Archegosauria. 



Suborder Mastodonsauria. 



The next classification of the extinct Amphibia of any importance was that 

 devised by the committee (450) for the British Association in 1874. This committee 

 was formed of Huxley, Harkness, Henry Woodward, Thompson, and Brigg, with 

 Miall as secretary. This classification is, however, too cumbersome and has never 

 come into general use, and indeed none but English authors have paid it a great deal of 

 attention, although the contribution was a valuable one. The group Aistopoda, which 

 was the ninth group proposed by the committee, has generally been accepted as the 

 group represented by the snake-like forms. The committee's classification follows: 



LABYRINTHODONTIA. 



Section I. Euglypta. 



Genera: Mastodonsaurus, Jaeger; Capitosaurus, Mtinst. ; Pachygonia, Huxley; Tretnato- 

 saurus, Braun; Gonioglyptus, Huxley; Metopias, von Meyer; Labyrinthodon, Owen; 

 Diadetognathus, Miall; Dasyceps, Huxley; Anthracosaurus, Huxley. 

 Section II. Brachyopina. 



Genera: Brachyops, Owen; Micropholis, Huxley; Rhinosaurus, Waldheim; Bothriceps, 



Huxley. 

 Section III. Chauliodonta. 



Genera: Loxomma, Huxley; Zygosaurus, Eich.; Melosaurus, Meyer. 

 Section IV. Arthroodonta. 



Genera: Batrachiderpeton, Hancock and Atthey; Ptcroplax, Hancock and Atthey. 

 Section V. An uncharacterized group. 



Genera: Pholidogaster, Huxley; Ichthyerpeton, Huxley; Pholiderpeton, Huxley. 

 Section VI. Archegosauria, von Meyer. 



Genera: Archegosaurus, Goldfuss. 

 Section VII. Heleothrepta. 



Genera: Lepterpeton, Huxley. 

 Section VIII. Nectridea. 



Genera: Urocordylus, Huxley; Keraterpeton, Huxley. 

 Section IX. Aistopoda. 



Genera: Ophiderpeton, Huxley; Dolichosoma, Huxley. 

 Section X. Microsauria, Dawson. 



Genera: Dendrerpeton, Owen; Hylonomus, Dawson; Hylerpeton, Owen. 



The schemes of classification used for the next 10 years did not depart in any 

 appreciable degree from those already given. 



In 1875 Cope, in his Check-list of North American Batrachia and Reptilia (120), 

 with a systematic list of the higher groups, published the following classification as 

 being "adopted provisionally by the Smithsonian Institution": 



Class BATRACHIA. 



Order Anura. (Anura, Dumeril; Salientia, Merrem, Gray.) 



Raniformia. (Raniformia, Cope, Nat. Hist. Rev., v, 114, 1865.) 



Families: Ranidce, Colostheida. 

 Firmisternia. (Bufonoid Raniformia, Cope, Jour. Acad. Nat. Sci., Philadelphia, n.s., vi, 



190, 1867.) 

 Families: Dendrobatidce , Phryniscida, Engystomid, Breviceptidce. 



