CHAP. XIII.] 



SYNDACTYLISM : PIG. 



387 



583. 



side. Landois, H., Verh. d. naturh. Ver. d. preuss. Rheitil., Bonn, 1881, S. 4, vin. 

 p. 127. 



Pig. " Solid-hoofed " pigs have been mentioned by many 

 writers from the time of Aristotle. The fact that they have 

 been reported as occurring in many parts of the world makes it 

 likely that the variation has often arisen afresh. The first case 

 (No. 583) is the only instance of complete union of III and IV in 

 the pig that is known to me. The variation is most commonly 

 simultaneous in fore and hind feet. As seen, it occurs in many 

 degrees. Several specimens not separately mentioned below are in 

 the Coll. Surg. Mus. and other collections. 



A fore foot and a hind foot of the same individual, in which the 

 two chief digits were completely united, viz. represented by a 

 single series of bones. 



In each case the two chief metacarpals and metatarsals (III 

 and IV) were respectively represented by a single large bone, and 

 with each a single digit of three phalanges articulated. The bones 

 of these digits were straight, and not curved as they are in an 

 ordinary foot in which two toes are present. There was not the 

 slightest trace of duplicity, and the lateral digits were placed 

 symmetrically on either side. The sesamoids were two in number 



A 



B 



Fig. 120. Bones of feet of solid-hoofed Pig, No. 583, from specimens in the 

 Museum at Alfort, described by Barrier. 



A. Left manus from in front. 



B. Left manus from behind. 



C. Left pes from in front. 



The numbers II and V indicate the digits so numbered in the normal. 



25—2 



