CHAP. XIII.] 



SYNDACTYLISM I PIG. 



389 



but longer in proportion to its breadth. The middle phalanges are 

 also represented by one bone in the lower two-thirds of their length, 

 presenting separate upper ends for articulation with the proximal 

 phalanges. The proximal phalanges are separate through their entire 

 length. The whole foot above the middle phalanges presents the 

 usual arrangement and proportions in the hog." Middle Phalanges. 

 " There is no symphysis or mark indicating a line of coalescence of the 

 two phalanges. The surface across the middle is somewhat irregularly 

 filled up to nearly the level of each lateral part. Each half of the 

 phalanx, as indicated by the notch between the separate upper ends, 

 has the full breadth of the proximal phalanx above it." Distal 

 Phalanx. The middle part of this is raised above the lateral parts, 

 and is partially separated from them by a fissure on each side, giving 

 it an appearance as of the union of three bones. The end of the 

 phalanx is notched like that of the horse ; it bears no trace of 

 symphysis. ' ' The ungual phalanx of one of the lesser internal toes of 

 the fore foot presents a bifurcation reaching half the length of the 

 phalanx." See Fig. 121. 



I. 



II. 



Fig. 121. I. A right fore foot of a solid-hoofed Pig, No. 585, from in front. 

 The ungual phalanx of the digit V is bifid [cp. Nos. 579 and 580]. 



(After Struthers.) 



II. Middle digits of foot of solid-hoofed Pig, No. 587. x, an extra ossification 

 wedged in between the phalanges of III and IV. (After Elliott Coues.) 



" Hind foot. In the hind foot only the distal phalanx is single 



There is no trace of double origin to the bone." Struthers, J., Edin- 

 burgh New Phil. Joum., 1863, pp. 273-279, Jigs. 



186. A pair of solid-hoofed pigs received by Zoological Society of London from Cuba 

 in 1876. The sow gave birth to a litter of six [the solid-hoofed boar being presumably 

 the father]. The six young were three males and three females. The hoofs were 

 solid like those of the parents in two males and one female : in the others the hoofs 

 were cloven as in the normal pig. The feet of one of the solid-hoofed males of this 

 litter were dissected, and it was found that " the proximal and second phalanges 

 are separated as usual, whilst at the extreme distal ends of the ungual phalanges 



