THE ST. JOHN'S RIVER, FLORIDA. 



161 



margin of the base and continuing through the central portion, human remains were 

 constantly met with on and in the shell base. In certain cases, determination 

 of the form of burial was impossible, owing to the ravages of decay and to the 

 intermingled condition of the bones, but in the case of the greater number the form 

 of burial was shown to be in anatomical order, though in various degrees of flexion. 

 In the white sand, somewhat above the base, but at depths to indicate original 

 burial, bunched interments were met with. Superficial burials were all in ana- 

 tomical order. 



Crania. — Though the bones in Thursby mound, owing to assimilation of lime 

 salts from the shell, were in a better condition than those from the down river 

 mounds, but two crania were saved in a comparatively unbroken condition. 

 (Academy of Natural Sciences Catalogue, Nos. 1781 and 1782.) 



Humeri. — Of 264 humeri from original burials on or near the base, 132, or 

 exactly 50 per cent., showed perforation. 



Side and Sex. 





Male. 



Female. 



Uncertain. 





Perforated. 



Not. 



Perforated. Not. 



Perforated. 



Not. 



Rights .... 

 Lefts .... 



19 

 22 



41 



40 



38 



78 



23 

 14 



37 



7 

 8 



15 



22 

 32 



54 



16 

 23 



39 



Size of Perforation. 

 Measzirements in mm. 



Male . 

 Female 

 Uncertain 



Average Minimum 

 Perforated. Diameter. Diameter. 



41 

 37 

 54 



4-97 



6-7 



6-4 



Maximum 

 Diameter. 



9-5 

 11-5 

 10-5 



Oscillation Exponent. 



2-19 

 1-32 

 2-1 



From the above tables it will be seen that of 132 perforations, 64 are from the 

 right side and 68 from the left, The excessive percentage of perforations in the 

 case of female humeri and in those of uncertain sex, which are doubtless mainly of 

 females of masculine build, is worthy of note In these two classes also, the size 

 of the perforation considerably exceeds that noted in male humeri. 



Seven superficial humeri contained 3 perforations. 



In caved sand, and therefore of undetermined depth, 15 humeri were found. 

 Of these all but 3 showed perforation, a percentage of 80. 



Of 14 humeri of children between one and twelve years of age. not included 

 in foregoing data, 3 showing perforation were noted ; one from a child of about 

 twelve years of age, with an opening 5 mm. in diameter ; and 2 from children about 

 six years of age, with perforation respectively 5 mm. and 1 mm. in diameter. 



