48 MESSRS. MURIE AND MIVART ON THE 
Insertion in Z. aanthomystax the proximal end of the first phalanx; there appears 
also to be a small, but distinct, slip of this muscle arising proximally to the larger 
superficial portion; this arrangement is somewhat similar to that of the muscles of 
the foot. 
Figured in Galago crassicaudatus (PI. II. fig. 3, and Pl. IV. figs. 13,14, & 15, Ad. p), 
whereas in G. allenii it is not nearly so strong as in Z. catta. ‘The fibres which pass to 
the second metatarsal are hardly distinguishable from the deep palmar fascia. 
In Tarsius' the adductor of the pollex appears to consist of two parts. 
In Cheiromys this muscle arises from the second metacarpal, and from the fascia on 
the palmar surface of the proximal part of the third metacarpal. A distal fascicle of 
this muscle is separated by a distinct interval, and represents a transversus manus. 
The similarity of structure (as regards muscles) of the manus and pes is strikingly 
shown in the Aye-Aye by the form of the adductor pollicis with its distinct slip homo- 
typal with the transversus pedis. 
FLEXOR BREVIS POLLICIS—The greater part of this muscle is external to the long 
flexor tendon of the pollex. It arises from the trapezium and annular ligament, and is 
inserted into the base of the first phalanx of the pollex. 
Displayed in Galago crassicaudatus (PI). II. fig. 3, and Pl. IV. figs. 14 & 15, F. d. p). 
Burmeister represents this muscle in Zarsius, loc. cit. tab. 5. fig. 4, no. 43. 
OPPONENS POLLICIS.—This muscle is represented but by a comparatively few fibres, 
which arise from the trapezium, and are inserted into the base of the metacarpal bone 
of the pollex. 
In LZ. wanthomystasx it is large and strong. 
In Zarsius it is quite as in Z. catta, and is well represented by Burmeister, loc. cét. 
tab. 5. fig. 5, no. 49. 
In the specimen of Cheiromys dissected by us this muscle was destroyed on the 
skinning of the body. 
FLEXOR BREVIS MINIMI DIGITI.—This seems to be scarcely distinct from the abductor, 
with which it is inserted. It arises from the unciform bone and annular ligament. 
Both Z. varius and L. vanthomystax have it distinctly separate from the abductor, 
and it is comparatively strong. 
In Galago crassicaudatus the flexor brevis minimi digiti is tolerably clearly defined 
(it is represented in Pl. Il. fig. 3, and Pl. IV. figs. 14 & 15, F.6.m.d). It is somewhat 
indistinct in G. allenii, but with an origin and insertion as in L. catta. 
Figured in Nycticebus tardigradus, P. Z. 8. 1865, p. 247, fig. 4. 
In Zarsius this is described by Burmeister as a division of the abductor digiti minimi, 
p- 66, tab. 5. fig. 42, d. 
We have found it tolerably distinct in Chetromys. 
The ABDUCTOR MINIMI DIGITI is a considerable muscle, which takes origin from the 
1 Loe. cit. p. 65, tab. 5. figs. 4 & 5, no. 45. ? Well defined in pl. 68. fig. 2, 0, of the ‘ Myologie.’ 
