THE EXTINCT BATRACHIA, REPTILIA 



STEGOCEPHALI. 



Usual cranial elements distinct, including frontals and pterygoids, and adding "postor- 



bitals and supertemporals." 

 Caudal vertebra;'? 

 Orbitosphenoids normal. 

 Inferior pelvic elements distinct. 



Mandible dentigerous; teeth with anchylosed bases, or in shallow alveoli. 

 Ethmoid. % 

 (A quadratojugal.) 



ANURA. 



Frontal and parietal confluent, nasals wanting or rudimental; other cranial bones present. 

 Postorbital, supratemporal, and usually nasals wanting. 

 Ethmoid an annulus (usually complete above) surrounding cerebral lobes. 

 Caudal vertebra; represented by an elongate compound style. 



Inferior elements of the pelvis consolidated into a single vertical mass; ilium attached 

 immediately to sacral vertebra?. 



STEGOCEPHALI. 



XENORHACHIA. 



The vertebral centra not ossified; the teeth simple; no branchial hyal bones; occipital 

 condyles. 



MICROSAURIA. 



Vertebral centra 'ossified; no branchial hyoids; teeth simple or with slightly inflected 

 enamel of the basis; occipital condyles. 



GANOCEPHALA. 



Vertebral centra cartilaginous; branchial hyoids present; teeth with inflected enamel, 

 anchylosed by their bases. No ossified occipital condyles. 



