63 



Aiitero-posterior diameter of base of neural spine of 2nd vertebra . 



3rd 

 " " " 4th " 



c( (( it 5th *' 



" " " 6th 



" 7th 



Length of iliac face along its curves 



" " " in a straight line 



Breadth of same at its anterior end 



" " " mid4ength ....'. 



" " " posterior end , . . 



Breadth of 1st vertebra at mid-height of its concave sides 



" 2nd " " " " 



II Srd " " '^ '' 



u 4th " " '^ '' 



" 5th " " " " 



" 6th " " " " . , 



" 7th " " " " 



Breadth at junction of 8th with 9th vertebra 



Distance from centre of neural canal to distal end of diapophysis of 2nd 



vertebra 



Distance to same of 3rd vertebra 



" " 4th " : .. . . 



" " 5th " 



" " 6th " 



" " 7th " 



070 

 081 

 092 

 085 

 077 

 070 

 5.58 

 533 

 075 

 056 

 045 

 103 

 096 

 079 

 072 

 073 

 088 

 150 

 187 



118 

 115 

 112 

 119 

 135 

 195 



The rostral bone, figured ou plate XX, and the small predentary bone (plate XIX, figs. 

 •5 and 6) were found separately and may with some probability of correctness be referred 

 to this species. A large ilium is figured toward the end of this report. 



This species is named iu honour of Dr. Greorge M. Dawson, C.M.Gr., late Director of 

 the Geological Siirvey of Canada. 



MONOCLONIUS CANADENSIS. Sp. nov. 



Plate XVII, figs. 3 and 4, and plate XYIII, figs. l-*7. 



This species is founded on a squamosal, part of a parietal, a jugal, a supraorbital 

 horn core, the left ramus of the lower jaw, and an anterior dorsal vertebra, with some 

 other parts of the skull, not yet fully determined, of one individual. A right ramus of 

 another individual is shown on plate XVIII, and a separate horn core on plate XVII. 



A right mandibular ramus, referred to this species on account of its resemblance in 

 form to the one shown above, is described farther on. 



The horn core (fig. 18, page 64) rises above the orbit from the postfrontal of which it 

 forms a part. The postfrontal unites behind, by suture, with the squamosal and below 

 with the jugal. The orbit is oval with the longer diameter vertical, its upper curve 

 lying close under the base of the horn core, its margins not ridged. The horn core is 

 small, about 216 cent, long from the upper edge of the orbit to its summit and 22-8 cent, 

 in circumference near the base, circular in section and solid. 



