282 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
digit. We can only conclude, then, that digit u, together with its ac- 
cessories, has atrophied. This manus is therefore only pseudo-penta- 
dactylous, and belongs in reality to the hexadactyle abnormalities. This 
conclusion is made possible only through the completeness of the poly- 
dactyle series which I have studied, and emphasizes the futility of at- 
Nl. M. 
\ 
r?. 
TS 
IV. III. 
Fia. T.— Posterior view of left polydactyle manus of the pig, showing innervation. 
12, 1», supernumerary digits; 1, first branch of the median nerve, which bifurcates to the 
extra digits; 2, second branch, a division of which innervates the rudimentary digit 11. 
% natural size. 
tempting to obtain general results from single cases of polydactylism. 
Except for the intermediate stages at my disposal, the true significance 
of the structural conditions shown in Figure 23 could only have been 
guessed at. 
— 
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