MOUND-BUILDEES AND PLATYCNEMISM IN MICHIGAN. 377 



"^hich gives the dimensions of " thirteen leg-bones taken indiscriminately 

 irom a drawer in the College of Surgeons, London." I have made a few 

 corrections, however, in re-computing from Professor Busk's elements 



Table V. — Dimensions, <^c., of ordinary English tihice. 







i . 





;^ CO Q 











.■^1 



1 



oil 



M 



g 



b 





, c o 



c2 



g 



3 

 O 





.3 



i 



■73 



<u 



,d 



> fe 



'a 



6S o-a 



o 



hs 



^ 



-t-L 



m a 





'" ® £ « 



a 



1) 



o 



a 



CD 







ID 



1=1 r- 



05 



cj n !-* ci 

 cS km 



1 



il 



IJ 



H^ 



h^ 



<d 



p-( 



h-! 



1 



16.7 



3.15 



3.4 



130 by 100 



0.203 



0.769 



2 



16.4 



3.2 



3.5 



150 bV 115 



0.212 



0.766 



3 



15.8 



2.95 



3.0 



120 by 90 



0.189 



0. 750 



4 



1.5.5 



2.95 



2.9 



140 by 90 



0.187 



0. 642 



5 



15.3 



2.9 



2.8 



130 by 90 



0.183 



0.692 



6 



15.2 



3.0 



3.2 



140 by 90 



0. 210 



0. 642 



7 



15.0 



2.8 



2.8 



140 by 90 



0.187 



0.642 



8 



15.0 



2.6 



2.8 



120 by 85 



0.187 



0.708 



9 



15.0 



2.6 



2.8 



120 by 90 



0.187 



0.750 



10 



15.5 



3.0 



2.9 



120 by 95 



0. 187 



0.791 



11 



13.5 



2.8 



2.9 



120 by 90 



0.214 



0.750 



12 



1.3.4 



2.75 



2.7 



120 by 85 



0.201 



0.708 



13 



12.8 



2.5 



2.4 



100 by 85 



0.187 



0.850 



!Meau .... 



15.0 



2.86 



2.9 



127 by 92 



0.195 



0. 727 



While the tibice from the Detroit and Eouge Elvers show a degree of 

 platycnemism somewhat in excess of that of the tihke from the head 

 of the Saint Clair Eiver, the latter have more of this peculiarity than 

 the Chambers Island specimens, which, in turn, have this compression 

 to an extent slightly greater than the bones from other (more southerly) 

 parts of the United States, as given by Wyman ; the last mentioned 

 being of about the flatness of the Welsh bones from Perthi-Chwaren, 

 which, as we have seen, are much flatter than the ordinary English 

 tibiae. 



The data for determining the perimetral indices are in some cases 

 hardly sufficient for establishing any j)ositive statement ; but, at least 

 in the American and Welsh tibice, the slenderness of the bone appears 

 to be related in some degree to the flattening; i. e., the more platyc- 

 nemic tibiw (taking the means) are the more slender. In individual 

 instances, however, this does not hold good. The ordinary English 

 tibiw, it will be noticed, are not so thick as the Perthi-Chwaren speci- 

 mens, but iu this respect come between the tibiw from the Detroit and 

 Eouge Elvers and those from the Saint Clair. Excepting the tibice 

 from Chambers Island, a remarkable uniformity, it will be observed, 

 exists in the means of the " transverse diameters of the proximal end ;" 

 and, the same may be said of the ''least circumferences." In length the 

 ordinary English tibice (modern) are in excess; the Michigan and Wis- 

 consin specimens come next ; while the ancient Welsh tibice are much 

 the shortest. 



For convenience of reference, I append a table exhibiting a compari- 

 son of the means of the different tables already given. 



