1913] The Ottawa Naturalist 111 



The nasal outline in advance of the horn is highly arched and 

 descends rapidly in front to 'the premaxilla. The sinuous 

 border of the squamosal slopes upward and backward, and its 

 general direction is continued behind by the anterior free 

 margin of the parietal. From this aspect the processes are 

 given oil one above the other in an ascending series. The 

 inferior outline of the premaxilla is obtusely angular and drops 

 to a point considerably lower than the alveolar border of the 

 maxilla. In general terms the skull's greatest depth, without 

 considering the nasal horn-core, is at the orbit, whence it is 

 reduced to some extent forward, and very conspicuously so 

 backward. 



At the time of writing, the upper and side surfaces only of 

 the skull had been freed from the matrix. Some of the sutures 

 are distinct and can be traced, others, where coossification has 

 taken place, are not seen with certainty or are entirely 

 obliterated. 



The neck-frill or crest is formed of the squamosals and the 

 immense expanse of the coalesced pari etals. The main part 

 of the squamosal is slightly broader than long and has its lateral 

 free edge regularly sinuous. Behind this, for a short distance, 

 the anterior, lateral border of the parietal is conspicuously 

 tortuous. The massive, tapering projections or outgrowths are 

 given off postero-laterally from the frill, three on each side. 

 These processes conform to the general slope of the part of the 

 frill from which they spring. The two forming the hindermost 

 pair are the largest and are directed backward and slightly 

 outward. Those of the next pair in advance are nearly as 

 large and point more outward than backward. The two an- 

 terior ones are the smallest, are nearly parallel to the middle 

 ones and spring partly from beneath them. The processes have 

 a perceptible curve outward. The central part of the posterior 

 border of the frill, between the hindermost processes, is thick 

 and rounded, its outline, as seen from above, being regularly 

 concave with a decided convexity at the base of the processes. 



The intraparietal fontanelles are irregularly oval in outline, 

 with the longer diameter from back to front. They are set 

 obliquely in the frill, being slightly divergent forward. They 

 are more distant from each other than from either the central 

 concavity of the posterior border, or the lateral sinuous margin 

 of the frill. Their anterior end approaches closely to the 

 squamoso-parietal suture. 



The nasals are greatly enlarged posteriorly for the support 

 of the nasal horn-core, whose anterior basal surface is slight! y 

 behind their mid-length. In advance of their union with the 



