60 MR. E. W. HOOLET ON THE SKULL AND [Feb. 1 0,0 7, 



YI. Comparisons with Gokiopholis tenuidens, Naknosuchus, 



AND OWEJSTIASUCHUS. 



Goniopholis tenuidens (Owen). 



The anterior end of the mandibles is the only portion of the skull 

 that is known ; this reveals no agreement with the same moiety in 

 G. crassidens. It differs by its : 



(1) Much smaller size and by the contour of the alveolar tract. 



(2) The high elevation of the incisary and median regions of the 

 alveolar tract, and its deep laniary concavity. 



(3) The sharp and more slender teeth. 



The Genus Nannosuchus (Owen). 

 Agrees in : 



(1) The general form of the skull. 



(2) The articulation of the dorsal scutes. 



Differs in : 



(1) The small size of the skull. 



(2) The shape of the supratemporal fossa?. 



(3) The relative magnitude of the orbits to the supratemporal 



fossae. 



(4) The outline of the posterior border of the skull formed by 



the parieto-squamosal bar. 



(5) The presence of an interorbital ridge. 



(6) The presence of a supraorbital bone. 



(7) The form and length of the nasals and their non-entrance 



into the nares. 



(8) The recurved slender teeth. 



(9) The form of the dorsal scutes. 



The Genus Oweniasuchus (A. Smith Woodward). 



Agrees in : 



(1) Mandibles similar in form, and their deeply-reticulated 



posterior external surface. 



(2) The absence of a mandibular vacuity. 



(3) The very slight laniary concavity. 



Differs in : 



The short extent of the alveolar tract. 



