II. CLASS AMPHIBIA, Latreille 



Ananmia, Anallantoidea, Tetrapoda. 



Median tins, when present, not supported by spinal 

 skeletal elements. 



With two occipital condyles, or none. 



Vertebrae acentrous, pseudocentrous, or notocentrous. 



With lungs, and with gills, at least until metamorphosis. 



1. Sub-CLASS PHRACTAMPHIBIA, Haeckel 



With a considerable amount of bony dermal armour. 

 \J STEGOCEPHALI, Cope. Cranial roof with dermal bones, 

 containing amongst others, two supraoccipitalia, two post- 

 orbitalia, two supratemporalia ; with interparietal foramen ; 

 with three bony pectoro-jugal plates. Tailed. 



Carboniferous, Permian, and Triassic epochs. 



1. Order Lepospondyli, Zittel. Pseudocentrous. 



1. Sub-order BRANCHIOSAURI, Zittel. With gills. 

 B ranchiosaur us. Lower Red Sandstone, Europe. 



2. Sub-order MICROSAURI, Dawson. Without gills. 

 Keraterpeton, Urocordylus. Carboniferous of Nova 



Scotia. 



3. Sub-order AISTOPODES, Miall. Without limbs and 

 without pectoral girdles. 



Dolichosoma, Ophiderpeton. Carboniferous of Ireland 

 and Bohemia. 

 2. Order Temnospondyli, Zittel. The component units 

 of the vertebrae remain in a separate, unfused state. 

 Chelydosaurus. Lower Red, Bohemia. 

 Sphenosaurus. Lower Red, Bohemia. 



