STENEOSATJRTJS. 



117 



In some cases the ridge is obscure, particularly in some scutes that may have come from 

 the nuchal region (text-fig. 48, B) ; these are considerably longer than wide, and their 

 straight inner edge is somewhat serrated, but perhaps was separated by a narrow space 



Text-fig. 48. 



Dorsal scutes of Steneosaurus leedsi : A, from back ; B, (?) from neck ; G & D, from tail. 



(R. 3806, | nat. size.) 



from the opposite scute. Other scutes of smaller size (text- figs. 48, C, D) have a very 

 prominent ridge and have both their inner and outer border strongly curved, so that 

 clearly they did not meet in the middle line ; at the same time, the anterior angle 



Text-fig. 49. 



Ventral scutes of Steneosaurus leedsi. (R. 3806, J nat. size.) 



forms a strong peg for union with the scute in front ; these probably formed one or more 

 rows on the tail. 



Besides these, there occur scutes in which no ridge is developed (text-fig. 49) ; these 

 probably formed the ventral armour. They are usually more or less quadrate in 



