460 MR. F. E. BEBDARD ON HAPALEMUR GRISEUS. [Juiie 16, 



covered on the under surface by tendon ; the muscles are not at all 

 distmct : the flexor profundus Rvises by one head from the ulna; 

 the fiexor poUicis by two heads, one from the internal condyle of 

 the humerus, the other from the radius. 



19. Extensor communis digitorum. — The muscle divides into three 

 tendons high up in the arm : the outermost of these divides into two, 

 one branch supplying digit V., the other fusing with the middle of 

 the three tendons : the tendon so formed divides into three ; two of 

 the branches supply digits IV. and III. ; the remaining branch 

 fuses with the innermost of the three tendons and supplies digit II. 



20. The Extensor secundi internodii pollicis is a long and slender 

 muscle ; it arises high up on the ulna from its radial surface ; the 

 tendon of the muscle commences about halfway down the forearm ; 

 it is inserted on the terminal phalanx of thumb. 



21. The Extensor ossis 7iietacarpi pollicis is a broad, flat, bipinnate 

 muscle arising from anterior two-thirds of radius and from the 

 interosseous membrane ; its tendon crosses over the area a little 

 before the wrist and is attached to the radial side of the head of the 

 first metacarpal. 



22. Extensor carpi radialis longior, — This muscle arises from 

 the ridge on the humerus leading to the extensor condyle ; its tendon 

 commences before halfway down the forearm and is inserted on to 

 the radial side of the head of the second metacarpal. 



2.3. Ex-tensor carpi radialis brevior. — This muscle aiises from 

 the extensor condyle of the humerus and from the septum between 

 itself and the extensor communis digitorum ; its tendon is inserted 

 on to the outer side of the middle (3rd) metacarpal. 



24, Extensor minimi digiti is a tolerably long and slender muscle, 

 arising from the external condyle of the humerus ; it divides at the 

 wrist into two tendons, which are inserted on to ulnar side of IVth 

 and Vth digits; just before its bifurcation it receives a slender 

 tendon from the extensor indicis. 



2.5. Extensor carpi ulnaris arises from the extensor condyle of 

 the humerus and from the ulna ; it is a single insertion. 



26. The Extensor indicis arises from the radial surface of the 

 ulna and from the interosseous ligam.ent ; it divides into two tendons ; 

 one of these joins the extensor minimi digiti as already described 

 and besides ends in a fascia ; the other tendon goes to index. 



Hind Limb. 



1. The Glutceus maximus is, as in other Lemurs, composed of two 

 separate parts ; the insertion of the posterior part of the muscle 

 extends right along the (einur to its very end. 



2. The Rectus femoi-is arises by a strong round tendon, which is 

 bifurcate at the origin ; the muscle is covered by the vastus 

 externus. 



3. The Fastiis externus is large and fleshy ; it presents no pecu- 

 liarities of origin or insertion. 



4. The Vastus intemus is barely half the sii?;e of the vastus 

 externus. 



