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NEW YORK STATE MUSEUM 



turn nariiim, and this gives the craniofacial hinge considerable 

 play. The zygoma is a straight, slender rod of nearly uniform 

 caliber, and in those skulls where maceration has been prolonged, 

 plainly shows the sutures of its component bones. But Kvo of '' 

 these are apparent, the maxillary, and one extending posteriorly 

 from it to articulate behind with the quadrate. This latter bone is 

 very differently formed from what it is in the falcons, for its 

 mastoidal head exhibits but slight twisting upon itself; the socket 

 for the zygoma is lateral ; the orbital process is large and well de- 

 veloped ; and relatively, the bone is not so broad transversely. 



At the base of the skull of Pandion we find a pterygoid to be of 

 fair length, horizontally expanded with sharpened borders for its 



]-"iG. 57 Left lateral view of the skull and mandible of Pandion. 

 Natural size. Drawn by the author from a specimen in the U. S. 

 National Museum 



anterior moiety, and in a less degree the reverse being the case for 

 the hinder end. These bones when articulated in situ are well sepa- 

 rated mesially, and either one makes a very considerable articulation 

 with its palatine. 



A palatine for its prepalatine portion is narrow, horizontal, and 

 of uniform width, the bone being in this part far separated from 

 the prepalatine of the opposite side. The postpalatine is rather 

 broad, slightly deflected downward, with rounded (or in some in- 

 dividuals, obliquely truncated) posteroexternal angle. These pala- 

 tines are in contact along the rostrum beneath, but slightly diverge 

 anteriorly to admit of articulation with the lamelliform and well 

 ossified vomer, which in turn rests by its anterior apex upon the 

 fused osseous mass composed of the front portion of the maxillo- 



