170 Mil. D. M. S. WATSON ON 



Family BranchiosauriD;E Fritsch. 

 With the characters of the super-order. 



Branchiosaurus Fritsch. Upper Coal Measures and Lower 

 Permian, Bohemia, Germany, and France. 



Micrerpeton Moodie. Coal Measures, Illinois. 

 Melanerpeton Fritsch. L. Permian, Bohemia and Saxony. 

 Pelosaurus Credner. ,, Saxony and France. 



? Dawsonia Fritsch. ,, Bohemia. 



Super-Order LEPOSPONDYLIA Zittel. 



Small Batrachia with a roofed skull and lepospondylous 

 vertebrae. 



Very few members of the super-order are at all completely 

 known, and these differ in many respects. In the structure of 

 the skull and lower jaw Batrachiderpeton and Diplocaulus show 

 clear resemblances to the Labyrinthodontia, perhaps only owing 

 to a common descent from Crossopterygian fish. 



Family Nectridia Miall. 



Lepospondyli with the posterior corners of the skull produced. 

 Two occipital condyles. Palate with a small parasphenoid and 

 small vacuities. Tail with long neural and haemal spines, ex- 

 panded and fluted at the ends. Accessory articulating facettes 

 between the vertebrae. 



Keraterpeton Hux. Coal Measures, Ireland and England. 



Urocordylus Hux. ,, ,, „ 



Batrachiderpeton Hancock & Atthey. Coal Measures, England. 



? Scincosaurus Fritsch. L. Permian. Bohemia. 



? Oestocephalus Cope. Coal Measures, Ohio. 



? Ptyonius Cope. „ 



? Sauravus Thevenin. U. Coal Measures, France. 



? Dicer atosaur us Jaekel. Coal Measures, Ohio. 



? Crossolelos Case. L. Permian, Oklahoma. 



Family Diplocaulid^e 



Lepospondyli with enormously produced corners of the skull. 

 Palate with a large parasphenoid and moderate-sized vacuities. 

 Tail long, with well interlocked vertebrae. 



Diplocaulus Cope. L. Permian, Texas ; IT. Carboniferous, 

 Illinois. 



Family Aistopodice. 

 Legless Lepospondyls. 



Dolichosoma Hux. U. Carboniferous, Ireland ; and other 

 forms not necessarily closely connected. 



Batrachia incerta sedis. 



Lysorophus (primitive Urodele ?) ; Cardiocephalus, 

 Gymnarthrus, etc. 



