THE EXTINCT BATRACHIA, REPTILIA 



STEGOCEPHALI. 



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



bitals and supcrtemporals." 

 Caudal vertebrae! 

 Orbitosphenoids normal. 

 Inferior pelvic elements distinct. 



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

 Ethmoid. 1 

 (A quadratojugal.) 



A N U II A . 



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

 Postorbital, supratcmporal, 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 1 . 



S T E (J O € E P II A L. I . 



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. 



