PEOTEKOSAtTKIA. 301 



R. 579 1. Fragment of the right palato-m axilla of a young individual, 

 with the teeth in an unworn condition ; from Maleri. 

 The triangular crowns of the teeth are well shown. 



R. 579 m. The anterior extremity of the left palato-maxilla ; from 

 Maleri. 



R. 579 n. Fragment of a damaged right palato-maxilla ; from 

 Maleri, 



R. 579 0. Fragment of the dentary bone of the right ramus of the 

 mandible ; from Maleri. Three lateral teeth on the inner 

 surface are shown. 



R. 579 p. Fragment of a dentary bone ; from Maleri. 



Order PROTEE0SAUEIA. 



In the one genus constituting this group the skull is very imper- 

 fectly known, but appears to have been of an elongated triangular form 

 with a closed palate, and teeth on the palatine, pterygoid, and vomer. 

 It is suggested that the nares were approximated to the orbit ; and 

 the teeth of the jaws appear to be anchylosed to the bone, but have 

 cavities beneath them. Cervical vertebrae much elongated and 

 apparently opisthoccelous ; postcervicals amphiccelous ; posterior 

 caudals with divided neural spines. Abdominal ribs present ; but 

 apparently no intercentra or uncinate processes. Pectoral arch and 

 both limbs approximating more or less closely to the Rhyncho- 

 cephalian type ; pectoral limb considerably shorter than pelvic ; 

 according to Baur two centralia in carpus, and one centrale in the 

 tarsus ; feet pentedactylate. 



This group is regarded by Seeley (< Phil. Trans.' 1887, pp. 187- 

 213) as of ordinal value ; but is included by Baur in the Rhyncho- 

 cephalia. The former proposal is merely provisionally followed in 

 this work. 



Family PROTEROSAURIDiE. 



The family characters are not yet distinguished from the ordinal. 



Genus PROTEROSAURUS, Meyer 1 . 

 The only named genus 2 . 



1 Isis, 1830, p. 518. — Amended from Protorosaurus. 



2 Seeley, Phil. Trans. 1887, p. 204, suggests that Proterosaurus mcycri may 

 indicate a distinct genus. 



