1913] The Ottawa Naturalist. 25 



The only bone not represented in either of the hands is the 

 terminal phalanx of digit II, which is shewn in dotted outline in 

 plate II, as a true hoof-bone on the assumption that, as the other 

 three digits bore flattened hoof-bones, it is probable that the 

 moderately long digit II had a terminal phalanx of this nature 

 also. Two fragments found lying near and in front of the second 

 phalanx of digit II of the left hand may be part of the missing 

 hoof-bone in this hand, but it was not found possible to identify 

 them as such. 



The second phalanx of digit JI is a distinctly triangular 

 bone and is preserved in both hands, where it occurs with its 

 pointed side directed inward. A similarly shaped bone is 

 described and figured by Mr. Brown as occurring in the manus 

 of Trachodon annectens as the second phalanx of digit IV with 

 its narrow side pointing outward. 



A carpal bone is preserved in each hand, in the same 

 position, viz., at the ulnar side of the end of the radius. In 

 addition, a smaller carpal bone was found in the right hand, at 

 the middle of the end of the ulna, but a corresponding second 

 carpal was not found in the left hand. 



The teeth of the Trachodon from the Edmonton formation- 

 whose fore feet are described above, agree in size, shape and 

 marginal sculpture with those of Trachodon mar ginatus, Lambe*, 

 from the lower horizon of the Belly River formation, whose beds 

 are exposed a few miles farther down Red Deer river to the 

 south-east. As the marginal sculpture of the teeth is one of 

 the principal specific characters of T. marginatus the specimen 

 from the Edmonton formation is regarded as belonging to the 

 species from the Bellv River formation until evidence is obtained 

 to prove that a specific difference exists between them. 



Explanation of Plates. 



Plate I The fore feet of the specimen of Trachodon from the 



Edmonton formation of Red Deer river, Alberta, Cat. 



No. 8399, shewing the bones in the position in which they 



were found. One-sixth the natural size. 

 Plate II The right fore foot of the same specimen, dorsal 



aspect, with the bones in, what is considered to be, their 



natural position. One-sixth the natural size. 

 Plate III Reproduction from a photograph of the fore feet, 



of the same specimen, as mounted . One-sixth the natural 



size. 



* Contributions to Canadian Palaeontology, vol. Ill (quarto), part II, 

 1902. New genera and species from the Belly River series. 



