PRENTISS: POLYDACTYLISM IN MAN AND DOMESTIC ANIMALS. 257 
carpals are present in the polydactyle manus, the trapezium is almost 
invariably duplicated, and the length of the scapholunar is correspond- 
ingly increased ; and the same is true respectively of the cuneiform and 
navicular in the abnormal pes. 
---0 IS. 
CAC. mee g 
--- NQU. 
CUD, w= ; 
3 ii MS CUNn 
ec cun. —- T= en’ cun. 
Fic. B. — Right pes of cat, showing hal- Fia. C.— Right pes of cat, showing du- 
lux abnormally developed. 1, hallux; asg., plicated hallux. 14, 15, duplications of hal- 
astragalus; cac., caleaneum; cudb., cuboid; lux; asg., astragalus; cac., calcaneum; cud., 
ec’cun., ecto-cuneiform ; en’cun., ento-cunei- cuboid; ec’cun., ecto-cuneiform; en’cun., 
form; ms’cun., meso-cuneiform; nav., navic- ento-cuneiform; ms’cun., meso-cuneiform; 
ular. (After Bateson.) nav., navicular. (After Bateson.) 
a 
B. OBSERVATIONS. 
Although a number of cases of polydactylism in the cat have come 
under my observation, it was not thought necessary to devote especial 
study to them, the careful work done by Bateson making that unneces- 
sary. Polydactylism in the dog, however, has never been adequately 
described. On account of the difficulty of obtaining suitable material, 
my own work on these abnormalities is far from being complete. 
