PLATE XLIII. 

 Jurassic Dinosaurs. — rREDENTATA. 



Stegosauridje. 



Page. 



Fig. 1. Skull of Siegoaaurus stenopa Marsh ; side view 186 



Fig. 2. The same skull ; front view 187 



Fig. 3. The same ; seen from above 187 



a, anterior nares; on, angular; ar, articular; b, orbit; c, lower temporal 

 fossa; d, dentary; e, supratemporal fossa;/, frontal; fp, postfrontal; 

 j, jugal; I, lachrymal; m, maxillary; n, nasal; oc, occipital condyle; os, 

 supraoccipital; }>, parietal; pd, predentary; pf, prefrontal; pm, premax- 

 illary ; po, postorbital ; g, quadrate ; «, splenial ; sa, surangular ; so, 

 supraorbital; sq, squamosal. 

 All the figures are one-fourth natural size. 

 330 



