PRENTISS: POLYDACTYLISM IN MAN AND DOMESTIC ANIMALS. 257 



carpals are present in the polydactyle manus, the trapezium is ahnost 

 invariahly 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. \ 



cub 

 ec' cun. 



IV. III. 



IV. 



Fig. B. —Right pes of cat, showing hal- Fig. C. — Right pes of cat, showing du- 



liix abnormally developed, i, hallux; as(j.:; plicated hallux, i", i^*, duplications of hal- 



astragalus; cac, calcaneum; cm6., cuboid; lux; rti^r., astragalus; coc, calcaneum ; CMi., 



ec'c«iM. , ecto-cuneilbrni ; enV<ni., ento-cunei- cuboid; ec'cun., ecto-cuneiform ; en^cun., 



form; jns'cwre., meso-cuneiform ; «a«., navic- ento-cuneiforni ; ms'cun., nieso-cuneiforni; 



ular. (After Bateson.) nav., navicular. (After Batesou.) 



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. 



