740° THE AMERICAN NATURALIST. [Vor. XXXIV. 
Mona PERCENTAGE 
PRESENT. 
ROO 42159 v. 4o or o 2 61.5 
New knpghnd s 5 39 2655 a 63 47.6 
Florida Rue a cT 56 44-7 
Ohio and Timber Pe ao vos 515 50.3 
w Mexico s 2I 61.9 
California : 3 158 67.1 
Miscellaneous £0.58 2550 d 61 54-1 
Mex ee E e c e aris 54 62.9 
aped Ados ee E 928 55.8 
Kui rat uu. og 447 70.3 
Total Pepe ut Rue TE x WT Y tys 59.2 
bones. The true interparietal, the composite and incomplete 
epactals may be distinguished with tolerable certainty, but the 
smaller bones at the apex of the occipital are not so readily 
identified. Following Washington Matthews,! I have consid- 
ered all Wormian bones at the lambda as falling in the class 
designated os triguetrum seu apicis. 
PERCENTAGE. 
E NUMBER. f 
om- | Com- In- Os quad- |Os friquetrum 
plete. | posite. | complete. | ratum. i 
KEXRNOR o 2. 4 3 49 40 | 0 o o send 
New England . . . 66 30] 6 o o " 
Florida i = 62 49 | 15 o o Pg 
Ohio ind onnies s | S 4-1 j 2 d 31 
Ne» Mexico... . 2. 21 o o o o = 
California’. . . . ..]| 159 191] ó o 1.2 47 
Miscellaneous . . . . 69 o 2.8 o o 13.0 
Mexico La x 57 18. | 18 o o na 
North Mawes 5 4 2 2 Pon 34 9 I 5 13 
re NEE r8 | 1.8 5 I.I 21.5 
TOME ovo age | 29] fa 3 7 15 
It will be observed that the complete or true interparietal 
bone occurs more frequently among North American tribes 
than among Peruvians. -This is in harmony with the results 
! The Human Bones in the Hemenway Collection, Mem. Nat. Acad. Sc 
vol. vi, p. 198. 
