370 li. S. IaM — Sleyosauriis imyulatus Marsh. 



keel snch as one sees in the crocodile and in other armored 

 dinosaurs, and of the spines as well with deep blood-vessel im- 

 pressions, implies a close-iitting horny integument which must 



Fig. 7. 



Fig. 7. Section of the proximal part of the tail. After Lull. 

 ron ; n, neural process ; other letters as in fig. 5. 



c, chev- 



have extended some little distance beyond the limits of the 

 bone. The character of the base in both plates and spines, 

 while indicating no articular connection with the underlying 

 endoskeleton, nevertheless gives evidence of a firm cushion of 



