THE OTTAWA I^ATURALIST. 



Vol. XVII. OTTAWA, NOVEMBER, 1903. No. 8 



THE LOWER JAW OF DRYPTOSAURUS INCRASSATUS 



(COPE).* 



Lawrence M. Lambe, F.G.S., F.R.S.C, of the Geological Survey of 



Canada. 

 (With three plates.) 



The following remarks on the lower jaw of Dryptosaurus 

 tncrassatus are the partial result of the examination of the remains 

 of two skulls of that species in the collection of the Geological 

 Survey of Canada, and are offered in advance of a more detailed 

 description of the specimens in course of preparation by the 

 writer at the present time. 



The two skulls are from the Edmonton series** of the 

 Cretaceous system of the North-West Territory, and were col- 

 lected by Mr. J. B. Tyrrell and Mr. T. C. Weston in 1884 and 

 1889 respectively. The first specimen, figure i, was obtained 

 two miles from the mouth of Knee Hills creek, a tributary of Red 

 Deer river, in the District of Alberta. The second, figure 2, was 

 found on the east bank of Red Deer river, about twenty-one miles 

 above the mouth of Knee Hills creek. 



A preliminary description of these specimens by Professor E. 

 D. Cope appeared, in 1892, in the Proceedings of the American 

 Philosophical Society.*** 



* Communicated by permission of the Acting Director of the Geological 

 Survey of Canada. 



•• Regarded by Tyrrell as comprising the uppermost beds of the Creta- 

 ceous system in Alberta. Geological and Natural History Survey of Canada 

 Annual Report, new series, vol. II, part E, 1886. 



•** " On the skull of the Dinosaurian Laelaps incrassatus. Cope." Proc 

 Amer. Philos. Soc, vol. XXX, p. 240. 



