44 THE COAL MEASURES AMPHIBIA OF NORTH AMERICA. 



Lydekker (393) in the next year proposed a system of classification which did 

 not depart widely from that proposed (450) by the committee of the British Associ- 

 ation for 1874. Lydekker's classification is as follows: 



Class AMPHIBIA. 



Order I. Labyrinthodontia. Order II. Apoda. 



Suborder i. Branchiosauria. Order III. Caudata. 



Family Protritonidce. Family Hyl&obatmchidce. 



" Apateonida. " Sirenida. 



Suborder 2. Aistopoda. Proteida. 



Family Dolichosomatid. Amphiumidce. 



Suborder 3. Microsauria. Salamandridce. 



Family Urocordylidce. Order IV. Ecaudata. 



Limner petidcB. Family Discoglossidce. 



Hyloplesionidce. Pelobatidce. 



" Microbrachida. " Palaobatrachida. 



Suborder 4. Labyrinthodontia vera. Cystignathida. 



Family Archegosauridce. Ranida. 



Diplospondylida. 

 Nyraniid. 

 Dendrer petida . 

 A nthracosauridce. 

 Mastodonsauridce. 

 Uncertain family, Eosaurus. 



In 1890 Doederlein proposed a scheme of classification which is notable on 

 account of the peculiar relations which it expresses between the groups relations 

 which, in reality, do not exist. His classification is as follows: 



Class AMPHIBIA. 



Ordnung I. Stegocephali. 



A. Microsauria. 



Unterordnung i. Branchiosauri. 



Genera: Branchiosaums , Dawsonia, Melanerpeton, Pelosaurus. 

 Unterordnung 2. Sauromorphi. 

 Familie i. Hylonomidce. 



2. Nectridce. 



3. Aistopodida. 



B. Ganocephala. 



Unterordnung i. Rhachitomi. * 



2. Embolomeri. 



3. Labyrinthodontia. 

 Ordnung II. Urodela. 



Ordnung III. Gymnophiona. 

 Ordnung IV. Anura. 



* 



In 1890 Lydekker used the same classification, with minor changes, which he had 

 used in his Paleontology. Credner, who wrote at about the same time (193), fol- 

 lowed Zittel's classification. Zittel in 1895 merely repeated his former classification. 

 In 1898 appeared Smith Woodward's Paleontology, where the following scheme is 

 adopted : 



Class BATRACHIA. 



Order I. Stegocephalia. Order II. Gymnophiona. 



Suborder i. Branchiosauria. Order III. Caudata. 



2. Aistopoda. Order IV. Ecaudata. 



3. Microsauria. 



" 4. Labyrinthodontia. 



