302 Dr. C. W. Andrews on some new Steneosaurs 



becomes convex from side to side, rising considerably above 

 the alveolar borders. The ventral surface is crently convex 

 from side to side. The splenials extend forward in the 

 symphysis to the 24th tooth. 



The dimensions of the type skull and mandibles (R. 3320) 

 of Steneosaui'us leedsi are : — 



Skull. cm. 



Total length 81 



Length in front of orbit 59 



"Width between outer angles of the quadrates .... 18 



Length of temporal fossae (inner side) 12 



Width „ , 7-3 



„ of f rontals between orbits 3-9 



,, opposite anterior border of orbit 10'5 



5, of middle of snout 4-3 



„ behind premaxillary expansion 2-9 



„ of premaxillary expansion 38 



Mandible. 



Total length 80 



Leiiiith of symphyslal portion 52 



Width at hinder end of symphysis 7 3 



„ at narrowest point behind anterior expansion 2'2 



Steneosaurus nasulus^ sp. n. (PI. IX. fig. 1.) 



The type specimen upon which this species is founded is a 

 nearly complete but somewhat crushed skull and mandible. 

 In some respects the skull shows an approximation to the 

 Teleosaur type, particularly in the relative shortness of the 

 temporal fossae in proportion to their width, and the position 

 of the orbits, v.-liich appear to have looked more directly forward 

 than in the other species of the genus. The frontals be- 

 tween the orbits are much sculptured with a number of pits 

 and strong rugosities ; the form of their anterior end cannot 

 be determined. The upper surface of the triangular area of the 

 parietals at the hinder end of the sagittal crest bears sculpture 

 like the frontal?. The rostrum is very long; in front of the 

 orbit the narrowing of the skull is rapid for a short distance, 

 then the sides of the slender rostrum become nearly parallel, 

 as it narrows very slightly till just behind the premaxillary 

 expansion, which seems to have been of considerable width. 

 The two posterior teeth in the preraaxilla are enlarged and 

 closely set together. The maxillary teeth are nearly equal in 

 size throughout the series : they seem to have been directed 

 forwards and downwards ; their crowns are comparatively 



