278 THE AMERICAN NATURALIST. [Vor. XXXVI. 
the middle of the malo-maxillary to very near the superior ter- 
mination of the zygomatic suture. Both divisions are slightly 
serrated. - 
The right malar bone is slightly higher than the left one, 
but the frontal process and to a less extent the body of this 
latter is broader. 
The situation of the malar sutures in this case is similar to 
that in the orang described by Flesch; the posterior termina- 
tion of the division in Flesch’s case lay, however, still some- 
what higher, terminating on the temporal border of the malar, 
slightly anterior to the zygomatic suture. 
Case 4 (Fig. 4). A Unilateral Complete Malar Division in 
a Cercopithecus callitrichus.— Among the forty skulls of Cerco- 
pitheci in the zoological collection of the 
American Museum of Natural History, New 
York City, there is one with a complete and 
one with a partial malar division. 
The skull with the complete division belongs 
to an adult female, C. callitrichus (No. 13,923), 
and shows besides the malar also a bilateral parietal division. 
The malar division is found on the left only ; there is no 
trace of a similar anomaly on the right side. 
The malar suture begins anteriorly at a point between the 
lower and middle thirds of the malo-maxillary articulation, runs 
backward parallel with the inferior border of the malar, and 
terminates in the curve of the temporal border of the bone, 
0.8 cm. anteriorly to the upper end of the zygomatic suture. 
The divided malar is in whole higher than the undivided one 
(l. 2.9 cm., r. 2.4 cm.), and its frontal process is broader; but 
the bodies of the two bones are of very nearly the same 
dimensions. | 
The lower separate portion is relatively narrow. 
_ Neither in this nor in any of the preceding cases is there an 
extension of any process of bone from the zygoma to the 
maxillary. 
Fic. 4. 
The case of a partial malar division in a Cercopithecus (Fig. 5) 
may be conveniently described in this connection. The skull 
showing this anomaly is that of an adult animal of unknown 
