PLATE XII. 



Fir,'. 1. Slereocephalna tutus, I.anibe, view of left side of speciiiieu figiucil on plate XI., one half the 

 natural size. Page 55. 



Fi". 2. Palatal view of the same : one-lialf the natural size. 



Fig. 3. Slereocephaius tutus, coo.ssifierl postcranial scutes, supei'ior view ; two sevenths the natural 

 size. Piige 56. 



Fig. 4. The same, anterior view. 



Fig. 5. Transverse section of rib (provisionally associated with .S'. tutus) ; one-half the natural size. 

 Page 55. « 



p, palatine ; s, suture ; pt, pterygoid ; v, interpterygoid vacuity ; ph, presphenoid and basisplienoid 

 element ; a, anterior ; b, posterior. 



