54 Bulletin Amertca?i Museum of Natural History. [Vol. XIX, 



SanrocepJialns in its heavy structure. The bones are much 

 thicker than those of specimens which I refer to S. xiphiros- 

 tris, as the following measurements indicate. 



S. xiph. S. good. 



Thickness of premaxilla 20 mm. above alveolar 



border 



" " maxilla 10 mm. below condyle. . 



" " " 10 mm. above alveolar 

 border at middle of 

 length 5.5 mm. 



The exact length of the maxilla cannot be determined, but 

 it is quite evident from the way in which the alveolar border 

 is curved upward posteriorly and the small size of the teeth 

 that the bone did not extend much farther backward. Alve- 

 oli for 3 1 teeth are counted ; and there are six alveoli in 20 mm. 

 The palatine malleolus, measuring from the articular surface 

 for the maxilla to that for the prefrontal, is high; not low, as 

 we find it in Ichthyodectes. 



The supramaxilla (Fig. 41, smx.) is present. In the draw- 

 ing this bone is lifted somewhat above its natural position. 

 It is fiat on the outside. On the mesial side it is traversed 

 longitudinally by a sharp ridge. 



This species was collected by C. H. Sternberg's party during 

 the year 1877, probably in Gove County, Kansas. 



The maxilla figured by Stewart as the type of Saurodon 

 hroadheadi resembles in outline and proportions that of Sauro- 

 cephalus goodeanns, but Dr. S. W. Williston has kindly given 

 me measurements which show that Stewart's species is every- 

 where much thinner. At 10 mm. below the condyle the 

 thickness is only 7 mm.; at middle of length, 10 mm.; above 

 the lower border, only 4.5 mm. 



Ichthyodectes anaides Cope. 



Ichthyodectes anaides Cope (E. D.), Proc. Amer. Philos. Soc. XII, 

 1872, p. 339; 5th Ann. Rep. U. S. Geol. Surv. Mont. etc. 1872, 

 p. 343; Bull. U. S. Geol. and Geog. Surv. Terrs. I, No. 2, 1874, 

 p. 40; Vert. Cret. Form. West, 1875, pp. 206, 274, pi. xliv, figs. 

 14, 15; pl- xlv, figs. 1-8. — Crook (A. R.), Palseontogr. XXXIX, 

 1892, pp. Ill, 123, pl. XV. — Hay (O. P.), Amer. Jour. Sci. (4), 



