46 MESSRS. MURIE AND MIVART ON THE 
This muscle ceases to be so distinct in Perodicticus', and more resembles its condition 
as existing in Lemur and Galago. Its distribution is as before stated in describing the 
flexor profundus. 
In Tarsius the flexor longus pollicis seems to be represented by the first two bellies 
of the deep flexor muscle described by Burmeister’. It supplies alone the pollex, and 
almost exclusively the index. 
As to Cheiromys, our specimen does not present precisely the same conditions as those 
described by Professor Owen’. It is readily resolved into three distinct heads, the 
middle one of which is very delicate, and has a long tendon extending high up, 7. e. 
above the middle of the forearm. 
This head takes origin, deeply, from the anterior surface of the humerus, just above 
the trochlea, beneath the head next described. 
This second head springs from the inner condyle and intermuscular fascia in close 
union with the palmaris longus and flexor sublimis. It constitutes a large fleshy belly 
to the middle of the forearm, where it joins the other heads. 
The third and deepest head arises from the middle third of the shaft of the radius. 
This broad portion continues fleshy almost to the wrist. 
These three heads unite to form a broad, strong, flat tendon, which becomes adherent 
at the wrist to that of the profundus. Immediately below this it divides into two 
tendons, which supply the second and third digits ; and fibres from its superficial surface 
join others from the flexor sublimis and profundus to form the flexor tendon of the 
pollex. We failed to observe that convergence of fibres upon the third digit which is 
mentioned by the learned Professor. 
The PRONATOR QUADRATUS arises from the ridge on the ulnar side of the lowest fourth 
of the ulna, and is inserted into the lowest fourth of the outer margin of the radius. 
Alike in all the other genera‘. In Galago crassicaudatus it is figured (Pl. IV. 
fig. 14, P. q). 
f. The Hand, Palmar and Dorsal Surfaces. 
PALMARIS BREVIS.—[This is distinct, though small, and arises from the fascia covering 
the pisiform bone, and is inserted into the skin on the ulnar side of the palm. 
It is also distinctly present in Z. varius, L. xanthomystaax, and L. nigrifrons. 
If present, not satisfactorily made out by us either in the Galagos, Loris, or Nycticebus. 
Our specimen having been skinned, we are unable to speak of this muscle in 
Cheiromys ; and it is not described by Owen. 
LumpricaLes.—These are four in number. The outermost springs from the radial 
side of the deep flexor tendon of the index, and is inserted into the radial side of that 
digit. 
‘ Loe. cit. p. 3d. * Loe. cit. p. 61, tab. 3. figs. 1 & 3, no. 34. 
5 Loe. cit. p. 63, pl. xxiii. fig. 4. * Tarsius, loc, cit. tab. 5. figs. 3, 4, & 5, no. 39. 
