644 MR. W. F. R. WELDON ON THE [DcC. 18, 



of the ulna through the distal fourth of its length, and passes over the 

 dorsal groove in the radial carpal bone to the tubercle on the outer 

 side of the thumb metacarpal. 



26. The flexor carpi ulnaris arises from the inferior portion of 

 the internal condyle of the humerus ; it is fleshy for half its length, 

 and then sends a tendon to the tubercle of the ulnar carpal. 



27. The extensor indicis et pollicis arises from the outer condyle, 

 and is inserted on the basal phalanx of the index finger, the tendon 

 giving a branch to the thumb. 



28. The extensor proprius indicis arises from two thirds of the 

 distal half of the interosseous border of the radius ; it crosses the 

 tendon of the ext. ind. et poll, to go to the base of the distal phalanx 

 of the index. About the middle of its course through the hand, the 

 tendon is joined by a slender muscular slip arising from the capsule 

 of the tarso-metatarsal joint. 



29. .Flexor indicis I arises from the deep surface of the proximal 

 half of the ulnar fascia, going over a groove in the ulna to the upper 

 surface of the second phalanx of the index. 



30. Flexor indicis II arises from the proximal half of the deep 

 surface of the ulna, and goes to the base of the second phalanx of 

 the index. 



31. BracJiialis anticus arises from the outer part of the anterior 

 surface of the humerus, between the epicondylar ridges, and inserted 

 to the inner margin of the ulna by a fleshy insertion two inches 

 long. 



32. The pronator longus has a tendinous origin, superficially to 

 all other muscles, from the inner condyle of the humerus ; its 

 insertion into the humerus is very long. 



33. Pronator brevis lies below the long pronator, and has similar 

 attachments. 



34. The supinator arises from the outer condyle above the extensor 

 indicis et pollicis, and is inserted into about four inches of the superior 

 margin of the radius. 



35. The extensor brevis pollicis arises from the proximal dorsal 

 tubercles of the thumb metacarpal, and goes to the dorsal edge of 

 the base of its phalanx. 



There are two abductors and one short flexor of the thumb. 



B. Muscles of the Hind Limb. 



1. The sartorius arises from the antero-inferior margin of the 

 crista ilii, and is not attached to any dorsal vertebra ; it is inserted 

 into the tibia on the inner side of the triceps tendon. 



2. The tensor fasciee arises from the gluteal fascia in front of the 

 acetabulum only in Leptoptilus, though in some Storks (Ciconia) its 

 origin extends behind the acetabulum. It is inserted into the fascia 

 covering the rectus femoris. 



3. The biceps arises from nearly the whole of the postacetabular 

 ridge of the ilium ; its tendon, after passing through the usual sling, 

 goes to the fibula, about two and a half inches below the head. 



