168 MR. A. SANDERS ON LIOLEPIS BELLI. [Feb. 6, 



The second slip has a longer and more slender tendon, which is per- 

 forated, the two halves joining again after the passage of the per- 

 forans, and being inserted as a single tendon into the base of the 

 second phalanx of the second digit ; the radial half is joined by the 

 tendon from the slip of the perforans, as mentioned above. The 

 third slip has three secondary fasciculi arising from it ; the one for 

 the third digit gives off two tendons, of which one passes on the 

 radial side of the perforans tendon, and, being joined by the tendon 

 of a supplementary slip from the broad part of the perforans tendon, 

 is inserted into the base of the third phalanx of the third digit ; the 

 other, passing on the ulnar side of the perforans tendon, is inserted 

 into the base of the second phalanx of the same digit. The fourth 

 digit monopolizes the remaining two secondary fasciculi of the third 

 slip ; each of these gives origin to a slender tendon, which, passing 

 on each side of the perforans tendon, unite to be inserted into the 

 base of the third phalanx of the fourth digit ; in addition, the 

 one on the ulnar side gives origin to an extra tendon, which, passing 

 on the radial side of the perforans tendon, is inserted into the base of 

 the fourth phalanx of the same digit, receiving the tendon of another 

 supplementary muscular slip from the broad part of the perforans 

 tendon. The slip for the fifth digit is inserted by two heads into the 

 base of the first phalanx, the perforating tendon passing between. 



Adductor quinti digiti arises from one of the bonels of the second 

 row of carpals, and, passing obliquely across the palm, is inserted 

 into the whole length of the radial side of the metacarpal bone of the 

 fifth digit. 



Interossei palmares are five in number, and are situated entirely in 

 the palm ; they arise from the second row of carpal bones, and, 

 radiating thence, are inserted into the base of the first phalanx 

 of each of the five digits. 



Supinator lonyus arises from the outer side of the humerus, proxi- 

 tnad of the outer condyle. It has an aponeurotic attachment to the 

 outer head of the triceps ; it is inserted into the entire length of the 

 radius, receiving a large accession of fibres from the extensor com- 

 munis digitorum. 



Extensor longus digitorum (figs. 1, 2, & 7) arises from the outer 

 condyle of the humerus and from the upper half of the two bones of 

 the forearm ; the radial side and deeper part is attached to the whole 

 length of the radius, and merges into the insertion of the supinator 

 longus. The superficial part divides into three flat tendons, the one on 

 the ulnar side dividing more proximad than the other two ; these 

 tendons are inserted into the bases of the second, third, and fourth 

 metacarpal bones, their edges being united by a thin aponeurosis. 



Extensor ossis metacarpi pollicis (fig. 7) arises from the lower 

 half of the ulna, and, crossing the lower part of the forearm, is in- 

 serted by a small flat tendon into the base of the metacarpal bone of 

 the pollex, forming a triangular muscle with its base towards the 

 radius. 



Extensor brevis digitorum (fig. 7) arises from the second row of the 

 carpal and from the bases of all the metacarpal bones, dividing into 



