1877.] *2t6\ [Cope. 



Measurements. M. 



Vertical extent of right pharyngeal „ . . .020 



Length of proximal limb 009 



of tooth line 009 



of distal limb 009 



Width at first tooth 004 



" at second tooth 008 



Length of third tooth .005 



Found by Chas. H. Sternberg in the Pliocene of Oregon. 



On some Saurians found in the Triassic of Pennsylvania, by G. M. Wheatley, 



By E. D. Cope. 



(Bead before the American Philosophical Society, Bee 21, 1877.) 



Thecodontosaurus gibbidens sp. nov. 



The only remains of this saurian which have come into my hands are two 

 teeth. They are in good preservation, lacking only the great part of the root. 

 They present the leaf-like outline characteristic of the genus, the crown 

 being strongly distinguished from the narrower root. The form is quite 

 robust, and contracts gradually to the apex. The cutting anterior and pos- 

 terior edges bound the inner face of the crown, from which they are sepa- 

 rated by a groove along their bases. They are interrupted by coarse serra- 

 tions, the apices of the denticles being directed upwards. These are much 

 reduced in size at the base of the crown. The cutting edges are not sepa- 

 rated from the external face by grooves. This face is very convex and 

 perfectly smooth. The inner face is convex between the grooves and is 

 marked with six or seven continuous sulci, which are obsolete at the base. 



The saurian which possessed the tooth described was not of large propor- 

 tions. The species differs from the English form in many respects ; e. g., 

 the greater convexity of the external face ; the basal grooves of the cut- 

 ting edges, the grooving of the inner face, the abrupt constriction below 

 the base of the crown, etc. 



Measurements. M. 



Diameter of crown \ anteroposterior 0070 



\ transverse 0045 



Length of crown 0038 



