426 



CRANIA FROM THE MOUNDS OF FLORIDA. 



Rudiments of a suture-line, which, if complete, would 'divide the bone, are 

 numerous. Kopernitzky, out of sixty-one Ainos skulls, found the traces of the 



suture in fifty per cent. 

 Tarenetzky * states that in 

 a series of seventy-seven 

 Ainos skulls collated from 

 the papers of many writers, 

 three examples (4 per cent) 

 of bi-partite malars and 

 thirty-nine (50 per cent) 

 with persistent inner 

 suture-trace were seen. 

 Donitz 2 found in Japanese 

 skulls a complete bi-parti- 

 tism in 9 per cent and the 

 suture-trace in 20 per cent. 

 Virchow 3 has examined 

 the crania of many races 

 with reference to the 

 suture-traces in the malar 

 bone. I have commented 

 on the rarity of the bi- 



Fig. 15. — Examples of supplemental ossicles at the malo-zygomatic suture, a, 1,556: partite malar bone in the 

 6, 5 ; c. 1,305 ; d, 1.442. 1 c ' l 



North American Indian. 4 

 In fig. 18 a fissure is seen extending from the middle of the malo-zygomatic 

 suture forward toward the maxilla. This is figured as an illustration of a line 



Fig. 16. — No. 1.225. showing 

 bi-partite malar bone. 



Fig. 17. — No. 83, showing bi- 

 partite malar bone. 



which on the whole is not rare. A yet more common 

 appearance and one which indicates the tendency for 

 lower part of the malar bone to separate from the upper 

 is seen by the inspection of the inner surface. Here 

 a groove is ordinarily seen in the American Indian passing from behind forward 



Fig. 18. — No. 1.6S9, malar bone, show- 

 ing a suture-trace extend iug for- 

 ward from the malo-zygomatic 

 suture. It is thought to represent 

 the first stage of the process 

 leading to the formation of the 

 bi-partite malar. 



1 Mem. Acad. Imp. des Sci., St. Petersburg, VII ser., XXXVII, 1890, 41. 

 » Mitth. d. deut. Gesellsch. f. Natur u. Volkerkunde Ostasiens, Yokohama, 1875, VIII. 39. 

 A. Tarenetzky, 1. e.,. p. 40. 



3 Monatsber. d. k. p. Akad. d. Wissensch., Berlin, 1881, 230. 

 * Toner Lecture, Smithsonian Inst., 1889. 



See 



