POLYDACTYLISM IN THE CAT. 
673 
Anatomical Notes by Mr. Steel. 
Fore foot. 
Each fore foot has six well-developed digits, and one 
rudimentary one. We shall designate these numerically 
from within outwards, thus:—1, 2, 2a, 3, 4, 5, 6. 2a is 
very small, and attached by ligament against the outer side 
of the distal phalangeal articulation of 2; it has a rudi¬ 
mentary claw and a small digital pad, and consists of a single 
small unequal phalanx. Two palmar pads are present, one 
common to 1 and 2; the other, the larger, common to 3, 4, 
5, and 6. Each digit has a well-developed digital pad (except 
1, which bears a very small pad). Each digit bears a well- 
developed claw, and of these 1 is the largest. 
Muscles. 
Oblique extensor of the metacarpus sends an extra extensor 
band, which runs to the ungual phalanx of 1. 
Extensor communis digitorum sends main extensor tendons 
to 3, 4, 5, and 6. 
Extensor digitorum lateralis sends a tendon to 3, as well 
as to 4, 5, and 6, which it usually supplies. 
Flexor metacarpi obliquus gains the supero-posterior part 
of metacarpal 5, after being attached to trapezium. 
Flexor digitorum perforatus inferiorly divides into five 
tendons, and of these one passes to each of 1 and 2 , none 
to 6. 
Flexor digitorum perforans gives off short palmares, which 
run to sesamoids of 2, 3, 4, and 5. The terminal tendon is 
attached by its divisions to 2, 3, 4, 5, and 6. 
Extensor proprius pollicis etindicis is attached only to 2. 
Analysis of muscular variations. 
No. 1 seems to be the superadded digit for :—(a) Perforans; 
is generally attached to all the digits, and is not to this. 
((3) Extensor communis digitorum runs to 3, 4, 5, and 6, 
hut not to 2, which thus seems the pollex, 1 being accessory 
to it. (y) The special median extensor tendon of extensor 
metacarpi obliquus runs to 1, and seems something quite 
superadded. (S) The anterior extensor of the metacarpus is 
attached to the metacarpals 3 and 4. (e) Also extensor pro¬ 
prius pollicis runs to 2. 
6 seems to be the superadded digit, for:—(a) Extensor 
digitorum lateralis; has an extra division to 3, hut this is 
mall comparatively. (f3) Perforatus sends no tendon 
