THE OTTAWA NATURALIST 



Vol. XXX. JANUARY, 1917. No. 10. 



ON CHENEOSAURUS TOLMANENSIS, A NEW GENUS AND 



SPECIES OF TRACHODONT DINOSAUR FROM THE 



EDMONTON CRETACEOUS OF ALBERTA.* 



By Lawrence M. Lambe, F.R.S.C, 

 Vertebrate Palaeontologist, Geological Survey of Canada. 



The present paper is descriptive of the skull of a trachodont 

 dinosaur of small size included in the Geological Survey vertebrate 

 palaeontological collection of 1915 from the Edmonton formation of 

 Red Deer river, Alberta. The skull displays an assemblage of 

 characters which clearly point to its belonging to a type generically 

 distinct from any hitherto described member of the Trachodontidae. 

 With the skull, and belonging to the same individual, were limb bones, 

 the pelvic arch, not altogether complete, vertebrae, and other parts of 

 the skeleton (field No. 6, cat. No. 2246) ; a second skull belonging to a 

 much smaller individual, was also obtained (field No. 2, cat. No. 

 2247) in beds of the same geological age. These remains were dis- 

 covered by George F. Sternberg, in charge of the field party, about 

 four miles apart in the valley of Red Deer river. The larger skull 

 is from the west side of the river, about five miles above Tolman ferry, 

 in sec. 11, twp. 34, range XXII, at 150 feet above the river level. This 

 locality is roughly twenty-seven miles above the mouth of Three Hills 

 creek, and eight miles west and somewhat north of Rumsey on the line 

 of the Canadian Northern railway. The smaller skull was found 

 farther up stream about one mile north-west of the mouth of Big 

 Valley creek on the west side of the river. 



The rock in which these remains occurred is "a hard, very fine 

 sandstone which is removed with difficulty from the bones. Mr. 

 Sternberg has most successfully freed both skulls from their matrix, 

 and has mounted the larger skull for exhibition. This larger skull is 



Communicated with the permission of the Deputy Minister of Mines. 



