No. 424.] DIVISION OF THE MALAR BONE. 279 
sex and variety. It is free from other abnormalities. The 
division occurs in the right malar bone. It begins distally in 
the deepest portion of the curve of the temporal border of the 
bone, is somewhat curved, well serrated, 
and extends forward to the middle of the 
body of the bone, It is equally pronounced 
on the anterior and posterior surface of the 
malar. The divided bone is externally very 
slightly higher than the other malar, and 
its body is slightly narrower. 
Case 5 (Fig. 6). — The skull of an adolescent male Lagothrix 
humboldti (specimen No. 6333, American Museum of Natural 
History, New York) shows a bilateral, antero-posterior, com- 
plete malar division. Anteriorly the division begins on each 
side slightly below the middle third of the maxillary border of 
the bone and from this point runs horizontally backward, to 
terminate on the temporal border of the malar. The posterior 
termination of the division reaches to within one millimeter of 
the superior portion of the zygomatic suture on the left and to 
within two and a half millimeters of the same on the right side. 
Both the anomalous sutures are serrated. They show both 
much better dorsally than ventrally. In this specimen there 
is on each side but a slightly incomplete temporo-maxillary 
arc. The large malar foramina (regular in these monkeys) are 
situated well above the divisions. 
The two malars are very nearly 
of equal size, except anteriorly, 
where the right bone is slightly 
higher. 
The skull shows no other 
anomalies, nor anything pathological. In three other skulls of 
monkeys of the same variety the malars are normal. 
— Case 6 (Fig. 7). — Among twelve skulls of Mycetes, in the 
American Museum of Natural History, there is one (No. 
14,169) which shows a complete unilateral malar division. 
The skull with a complete division is one of an adoles- 
cent male M. alouata, and is otherwise in every respect 
normal. ihi i den 
Fic. 5. 
R PAR. 
Fic. 6. 
