SAUllOFFERYGIA. 



163 



Lariosaurus (figs. 103, 104). This genus comprises small animals 

 rarely attaining a metre in length, all of Triassic age and much more 

 lizard-like in shape than those of the genera of Liassic and later date. 

 The head is of moderate size, with numerous prehensile teeth and very 

 large supratemporal vacuities. One small specimen shows the posterior 



FIG. 104. 



Lariosaurus balsami ; restoration of palate, with outline of mandible, about 

 nat. size. M. Triassic (Muschelkalk) ; Lombardy. ang., angular; ar., 

 articular; d, dentary; ept., ectopterygoid ; p, palatine; pt., pterygoid; 3, 

 quadrate; s.ang., surangular; sph, splenial ; v, vomer. The three pairs of 

 vacuities are respectively the posterior nares, the suborbital vacuities, and 

 the infratemporal vacuities. (After Boulenger.) 



or internal nares exposed on the palate (fig. 104) in their primitive 

 position on either side of the vomers, bounded behind by the palatines ; 

 there are also suborbital and infratemporal vacuities in the palate ; and 

 the pterygoids seem to meet throughout their length in the median line, 

 reaching the vomers in front, and each bearing a longitudinal series of 

 small teeth at the margin bounding the infratemporal vacuity. There are 



112 



