No. 448.] 



PARIETAL DIVISION. 



detail), a suture separates the left sphenoidal angle ; in one 

 (No. 82,779), there are two fissures, each 10 mm. long, in 

 the superior third of the coronal border of the left parietal. 



9 Hapale no division in 8 ; in one (No. 36,222, described in 

 detail) a bilateral complete vertical division. 



4 Midas ...... no division. 



I Aotus u u 



1 Brazil monkey No. 984, there is a 4 mm. long, vertical fis- 



sure in the superior border of the left parietal, slightly ante- 

 rior to its middle. 

 7 Chrysothrix no division. 



2 Lagothrix . . . . . " " 

 10 Mycetes ^ 



4 Alonata 



I Nictipithecus rufipes . . . . " " 

 16 Ateles no division in 14; in one ^. gcoffroyi {^o. 8,974), 

 young, the left parietal shows two incisures, one horizontal, 

 10. mm. long, just above the lower third of the coronal 

 border, and one vertical, 15 mm. long, running from the 

 middle of the sagittal border. In one A. atcr (.\'o. 63,4-5)- 

 there is in each parietal, a short distance anterior to the 

 middle of the superior border, a vertical, 9 mm. long hs^uic. 



by the exami 

 National Museum series of monkey skulls is the 

 of parietal divisions in adult specimens. The c 

 forms should be sought for preferably in the youi 

 synostosis is later at least in some, and at tmu 

 normal parietal articulations than in the abnfjrmal 



