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 24 (Plate 16). Digits 1* and 1” are well formed and each con- 
sists of three phalanges, but between them, and articulating with the 
n. MM, 
(A) 
IV. III. 
Fic. U.— Posterior view of left polydactyle manus of the pig. . m., median nerve; 
1, first branch of median nerve, supplying digits 14, and 1>; 2, second branch, innervating 
digit 111; its small radial division is wanting. 4% natural size. 
proximal end of the second phalanx of 1°, 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 (¢rz., trz.’), and the scaphoid is also duplicated. 
