47 



bQUAMATA. 



Troodon, Leidy. 



Tboodon fobmosus, Leidy. 



TroSdon formosus, Leidy. 1857. Proc. Acad. Nat. Sci. Philadel., vol. viii, p. 72, and 1860, Trans. 

 Amer. Philos. Soc. Extinct Vertebrata from tiie Judith river and Great Lignite formations of Nebraska, 

 p. 147, pi. 9, figs. 53, 54 and 55. 



Two teeth from Red Deer river, below the mouth of Berry creek, agree with 

 Leidy's type iu every essential particular and are evidently referable to his species. 



One of the specimens has eleven denticles on either side of its cutting edge and is 

 slightly worn, near the apex, on its less convex side. The other has eleven denticles on 

 one edge and is similarly worn near the top, but one or two serrations are broken oft 

 near the base of the opposite edge so that nine only can be counted. The hollow bases 

 of both teeth are imperfect below. 



Belly River series. Red Deer river, 1901. 



This species is placed provisionally with the LacertiUa. 



CROCODiLIA. 

 Crocodilus humilis, Leidy. 



Crocodilus humilis, Leidy. 1860. Trans. Amer. Philos. Soc. Extinct Vertebrata from the Judith 

 river and Great Lignite formations of Nebraska, p. 146, pi. 11, figs. 9-19. 



Teeth of this species are found abundantly iu the rocks of the Belly River series. 

 They are in the form of elongate cones, slightly curved inward, w^ith two angular longi- 

 tudinal ridges defining the slightly flattened inner side. They are generally quite 

 smooth, but in some specimens, a distinct folding or corrugation of the surface is observed 

 more particularly in the upper half of small and medium sized specimens. Their bases 

 are slightly excavated. The apices generally show signs of wear. 



I^umerous examples also occur of the low, rounded germ-teeth, figured by Leidy, 

 that have a silky lustre, caused by the presence of minute, close-set, discontinuous 

 ridges in the enamel, converging toward the apex. They are, however, sometimes elon- 

 gated so as to be moderately pointed above. 



Belly River series, Red Deer river, 189*7, 1898 and 1901. 



Teeth of G. humilis had previously been collected, brit not determined, from the 

 isame series of rocks, as follows : — Professor John Macoun, Mackay creek, near "Walsh, 

 a station on the line of the Canadian Pacific Railway, east of Irviue, 1880 ; Dr, Gr. M. 

 Dawson, Belly river, N.W.T. (Nos. 40 and 41), 1881 ; Mr. T. C. Weston, Ross coulee, near 

 [rvine, 1884, and Irvine coulee, also near Irvine, 1888. 



