3o8 



THE AMERICAN NATURALIST. [Vol. XXXVIII. 



plainly traceable. The varieties, and the parietal divisions found, 

 are as follows : 



1 1 Lemurs no division. 



6 Galagos ^ 



I Tardigradus . . . . " " 



II Propitheci « 



I Gorilla « .< 



I Chimpanzee " 



1 1 Gibbons 



23 Semnopitheci . . . " " 



27 Presbytes u ^ 



8 Simias concolor . . . " " 



I Xasa/Is /arvat^^s 

 I Cynopithccus niger 



82 Macaques no division in 79 ; in one, from Siam (No. 83,- 

 274), there is in the right parietal above the sphenoidal 

 angle a moderate size, curving, antero-posterior fissure ; in 

 one M. rhesus (No. 83,476), a vertical fissure runs on the 

 left from the posterior third, on the right from the poste- 

 rior fourth of the sagittal border towards near the middle 

 of each parietal ; in another, M. rhesus (No. 63,379), there 

 is on the left parietal a trace of what was probably a com- 

 plete vertical suture, running from the middle of the sagit- 

 tal to the inferior border of the bone. 



15 CynocephaU no division in 14; in one (No. 22,904), young, 

 there is a partial vertical division in each parietal, left 10 

 mm. long and starting from between the anterior and mid- 

 dle thirds, right 19 mm. long and starting from between 

 the third and last fourths of the sagittal border. 

 I Colobus ...... no division. 



5 Cercocebi . . . . '< 



19 Cercopitheci no division in 18 ; in one (No. 36,277), there is 

 in the right parietal a vertical-oblique fissure which begins 

 superiorly between the anterior and middle thirds of the 

 sagittal border and rims to the parietal eminence. 



34 Cebi no division in 32 ; in one (No. 59,298, described in 



