STEGOCEPHALIA 



127 



Kiikenny, Ireland. Lower Permian ; Niirschan, Bohemia. U. scalaris, 

 Fritsch. 



Acanlhostoma, Credner (Fig. 213). Skull 25-35 cm. long, sharply para- 

 bolic in outline, externally pitted. Orbits relatively small, rounded, placed 



Urocordylus wandcpforcUi , Huxley. 

 Coal Measures ; Kilkenny, Ireland. 

 Caudal vertebrae, Vi (after Huxley). 



Keraterpeton crcissum, Fritsch Lower Penman Nui'^i^liin, 

 Bohemia. Restored i/i (aftei Fritsch) 



QMi 



Palatal aspect of skull ot Acanthohtoma 

 vorax, restored, i/j (after Credner). A, 

 Orbit ; N, Internal nares ; Pmx, Pi'e- 

 maxilla ; M:r, Maxilla ; Qui, Quadrato- 

 jugal ; PSph, Parasfihenoid ; Ft, Ptery- 

 eoid. 



in posterior half of the skull, and with sclerotic ring. All bones of the 

 buccal cavity set with teeth. Lower Permian ; Saxony. 



Family 2. Aistopodidae. Miall. {Aistoijoda.) 



Body serpenfAform, witJiout either limbs or arches for their support. Vertebrae 

 constricted amphicoelous cylinders. Teeth simple, conical, hoUoic. Bibs slender, 

 with one or two processes. Carboniferous and Permian. 



