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: 



Order II. Apoda. 

 Order III. Caudata. 



Family Hyl<Eobatrachid(B. 

 Sirenidw. 

 " Proteulw. 

 " AmphiwnidtB. 

 " Salamandridce. 

 Order IV. Ecaudata. 



Family Discoglossidce. 

 " PelobaiidcB. 

 " PaUBobatrachida. 

 " Cystignathidw. 

 " Rantd(B. 



Class Amphibia. 



Order I. Labyrinthodontia. 

 Suborder i. Branchiosauria. 

 Family Protritonidw. 

 " Apateonidae. 

 Suborder 2. Aistopoda. 



Family Dolichosainatidce. 

 Suborder 3. Microsauria. 

 Family Urocordylida. 

 " Limner petidcB. 

 " Hyloplesionida. 

 " MicrobrachidoB. 

 Suborder 4. Labyrinthodontia vera. 

 Family ArchegosauridcB. 

 " Diplospondylidas. 

 " NyraniidcB. 

 " DendrerpetidcB. 

 " Anthracosauridce. 

 " MastodonsauridtB. 

 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. 



Ordnimg I. Stegocephali. 



A. Microsauria. 



Unterordnung i. Branchiosauri. 



Genera: Bratichiosaurus, Dawsonia, Melanerpeton, Pelosatirus. 

 Unterordnung 2. Sauromorphi. 

 Familie i. Hylonomidw. 

 " 2. Nectridm. 

 " 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. 



Suborder i. Branchiosauria. 

 " 2. Aistopoda. 

 " 3. Microsauria. 

 " 4. Labyrinthodontia. 



Order II. Gymnophiona. 

 Order III. Caudata. 

 Order IV. Ecaudata. 



