40 THE COAL MEASURES AMPHIBIA OF NORTH AMERICA. 



reptiles was at times disputed, but no one seemed to pay any attention to the argu- 

 ment of Quenstedt in 1850 that "Die Mastodonsaurier im griinen Keupersand- 

 stein Wurtemburgs sind Batrachier" (527), nor to the contention of Vogt (581) in 

 1854 that " Archegosaurus imd alle Labyrinthodonten sind Amphibien, nicht Rep- 

 tilien." 



In 1842 von Meyer (420) proposed to include all the early forms allied to the 

 Mustodonsaurus in the " Labyrinthodontes. " His definition of the group follows: 



Labyrinthodontes: Saurier deren Zahn-Struktur jener ahnlich ist, welche in den nach prismat- 

 ischer Art gebautcn Saugcthier-Zahnen wahrgenommcn wird, u.s.w. 



I. Mastodonsaurus Jaeger. {Salamandroides Jaeger, Batrachosaurus Fitzinger, Labyrinth- 



odon Owen.) M. Jaegeri Meyer. 

 II. Capitosaurus Munster. 

 C. arenaceus Munst. 

 C. robustus Meyer. 

 III. Metopias Meyer. 



M. diagnoslicus Meyer. 



Three years later von Meyer (423) proposed his "System der fossilen Saurier," 

 where the extinct Amphibia are treated as follows: 



Labyrinthodontes. 



1. Prosthopthalmi (Augen-hohlen in der vordem Halfte der Schadel-Lange) Metopias 



Meyer Keuper. 



2. Mesopthalmi (Augen-hohlen in der mitte der Schadel) 



Mastodonsaurus Jaeger — Keuper, Muschelkalk. 



3. Opisthopthalmi (Augen-hohlen in der hintem Halfte der Schadel-Lange) Capitosaurus 



Munster Keuper. 



4. Labyrinthodonten ungewisser Stellung. 



Labyrinthodon Owen Keuper. 



Xestorrhytias Meyer Muschelkalk. 



Odmitosaurus Meyer Bimter Sandstein. 



Trematosaurus Braun Bunter Sandstein. 



No other classification was proposed for the extinct Amphibia for 1 5 years, when 

 Owen (512) in 1859 proposed the new order Ganocephala and retained von Meyer's 

 Labyrinthodontes under Labyrinthodontia. Owen's classification is as follows: 



Class — Reptilia. 

 Order I. Ganocephala. 



Genera: Archegosaurus, Dendrerpeton, Raniceps. 

 Order II. Labyrinthodontia. 



Genera: Mastodonsaurus, Anisopus, Trematosaurus, Metopias, Capitosaurus, Zygosaurus, 

 Xestorrhytias. 



In his Paleontology published in 1861, Owen gives the same classification, but 

 adds new genera. 



Huxley in 1863 (332) did not accept Owen's Ganocephala, but instead proposed 

 the following: 



Labyrinthodontia. 



A. Archegosauria. Archegosaurus, Pholidogaster . 



B. Mastodonsauria. Mastodonsaurus, Labyrinthodon, Capitosaurus, Trematosaurus. 



In the same year Dawson proposed (208) the term Microsauria to include the 

 genera Hylonomus, Dendrerpeton, and Hylerpeton, all known from the Carboniferous 



