PRENTISS: POLYDACTYLISM IN MAN AND DOMESTIC ANIMALS. 283 



Conditions are rare where more than two supernumerary digits occur 

 in the polydactyle manus. Such a condition, however, is shown in 

 Figure 2-i (Plate 16). Digits i" and i'' are well formed and each con- 

 sists of three phalanges, but between them, and articulating with the 



n. m. 



Fig. U. — Posterior view of left polydactyle maniis of the pig. n. m., median nerve; 

 1, first branch of median nerve, supplying digits I", and i''; 2, second branch, innervating 

 digit III; its small radial division is wanting. § natural size. 



proximal end of the second phalanx of i*, is an elongated bone, which, 

 from its position and form, may represent a first phalanx fused to a 

 portion of a metacarpal. In the carpus we find the trapezium repre- 

 sented by two elements (t7-z., tr-.'), and the scaphoid is also duplicated. 



