187.) 231 iene. 
Measurements. M. 
Vertical extent of right pharyngeal.............. seeeee 020 
Length of proximal limb. ................006 faaxatitaans 009 
HE SOF TOOT ING s sisiaeigie oY inbasaiyaedis saa oleae dears 009 
© OF distal WMDs... aici wae venaiveed es ror 009 
Width at first tooth. 0.0.0... c cece ence cena eee cneees . 004 
** cat second (00th aise sseadestees ce esaa widen aasees «008 
Length of third tooth... 2... 0 ec ccc cece cece e eee ee eens 005 
Found by Chas. H. Sternberg in the Pliocene of Oregon. 
On some Saurians found in the Triassic of Pennsyluania, by C. M. Wheatley. 
By E. D. Cor. 
(Read before the American Philosophical Society, Dec. 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 groové 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 { antero-posterior ........4+ peewee 0070 
transverse. .........- ; nobus 15x SG 0045 
Length of Crown... . cece cere ccc erect eee eeeeeeeee »» .0088 
