314 



bulletin: museum of comparative zoology. 



EXPLANATION OF PLATES. 



The figures are all reproduced from natural size skiagraplis of the polydactyie 

 specimens; in every plate the distal ends of tiie extremities are down, but right 

 and left are reversed. liiglit extremities therefore appear as left in tlie figures, 

 and vice versa. 



asg 



cac 



cub 



cun 



ec'cun. . . . 

 en'cim. . . . 

 ext. com. dg. i. . 



ext. mt'carp. mag. 



ext. mt'carp. oh. 



ext.prp. . . . 



ext.prp.ex. . . 



ext. prp. i. . . 



fix. per/. . . . 



ABBRE 



Astragalus. 



Calcaneum. 



Cuboid. 



Cuneiform. 



Ectocuneiform. 



Entocuneiform. 



Extensor communis 

 digitorum internus. 



Extensor metacarpi 

 magnus. 



Extensor metacarpi 

 obliquus. 



Ext. proprius poUicis 

 et indicis. 



Extensor proprius ex- 

 tern us. 



Extensor proprius in- 

 ternus. 



Flexor perforatus. 



VIATIONS. 

 Jlx. per/.' 

 lun. . 

 ms'cun. 

 mt'carp. 

 vit'tar. 

 nav. . 

 n. m. . 

 n. uln. 

 OS. mag. 

 phlx. , 

 pis. 

 scph. . 

 trz. . 

 trzd. . 

 un. 



i-v . 

 1-6 . 



Flexor perforans. 

 Lunar. 



Mesocuneiform. 

 Metacarpal. 

 Metatarsal. 

 Navicular. 

 Median nerve. 

 Ulnar nerve. 

 Os magnum. 

 Phalanx. 

 Pisiform. 

 Scaphoid. 

 Trapezium. 

 Trapezoid. 

 Unciform. 

 First to fifth digits. 

 First to fifth branches 

 of the median nerve. 



