FURTHER INSTANCES OF MALAR DIVISION. 



ALES HRDLICKA. 



By the courtesy of Dr. Horace Jayne, Director of the Wistar 

 Institute, Philadelphia, I am able to report on two skulls, one 

 Peruvian (Indian) and the other that of a Chinese, in both of 

 which is found what appears to be a bilateral, complete, malar 

 division. The specimens and anomalies are as follows : 



(i) Spec. No. 53, Wistar Institute, cranium of a male, adult 

 (past middle age), Peruvian Indian. The occiput shows a mod- 

 erate, predominantly unilateral, baby-board compression. A 

 smaller Wormian bone is present in the left coronal suture and 

 an unusual bone of the same nature, lo mm. long and 9 mm. in 

 maximum breadth, in the sagittal suture, 28 mm. posterior to 

 bregma. The skull shows no pathological lesion, no signs of 

 traumatism, and no marked anomalies besides those to be 

 described. 



Each of the malars is completely divided by an antero-poste- 

 rior suture into a smaller lower and larger upper portion. The 

 condition is very much alike on the two sides and offers a num- 

 ber of points of special interest. (Fig. i.) 



The body of each malar is very narrow (antero-posterior 

 diameter, dorsally, at middle, 13.5 mm. on the right and 12.5 

 mm. on the left). This narrowness is caused by an unusual 

 development and extension backward of the malar process of 

 the superior maxillary. The central part of the malar bone was 

 apparently belated in development and a compensation for the 

 defect by the maxillary took place. 



The upper, larger portion of each malar shows in its zygo- 

 matic border a well marked, 5 mm. long, slightly dentated suture 

 corresponding to the occasional posterior incomplete suture of 

 the normal malar. This suture is supposed to be the remnant 

 of the embryonal separation between the parts of the malar 

 that develop from respectively the superior and inferior center 



