ANATOMY OF THE LEMUROIDEA. 49 
pisiform bone, and is inserted by a long flat tendon into the outer side of the base of 
the first phalanx of the fifth digit. 
Substantially the same in all the other genera of Lemuroids. It is shown in pl. 68. 
fig. 2, v, of Cuvier’s ‘ Recueil,’ Lemur varius, and by us in Galago crassicaudatus, 
Pl. Il. fig. 3, and PL IV. figs. 14 & 15, Ab.m.d, in Nycticebus tardigradus, P. Z. 8. 
1865, p. 247, fig. 4, and in Tarsius, tab. 5. fig. 5. 42 a. 
The OpronENs MINIMI digiti is very distinct. It arises from the unciform bone and 
annular ligament, and is inserted into the whole length of the metacarpal bone of the 
fifth digit. 
In Galago crassicaudatus and in @. allenii this muscle is small, but distinct (Pl. IV. 
fig. 15, Op.m.d). It is indicated in the enlarged view of the palmar surface of the 
manus of NVycticebus, infra, woodcut, fig. 18. 
It is not mentioned by Burmeister in Tarsius; and in Cheiromys we have found it as 
in L. catta. 
InTEROSSEI.—The interossei muscles of the hand resemble those existing in Man. 
Each digit, except the pollex, has in fact a pair of interossei (which are, indeed, true 
flexores breves); the outer one of the fifth digit, however, is described separately under 
the name of ‘ Abductor minimi digiti.” 
Those of Nycticebus tardigradus are delineated in the accompanying woodcut, fig. 18. 
Enlarged and somewhat diagrammatic view of the 
palmar surface of the hand in the Slow Loris, 
to show the small muscles of the pollex and 
fifth digit, also the interossei and insertions 
of the lumbricales. The latter are cut short 
and reflected.—From P. Z. 8. 1865, p. 247. 
In the genus Galago the interossei of the manus, so far as appearance and attach- 
ment are concerned, might with propriety be divided into dorsal and palmar; but as 
their action is mainly abduction and flexion, it may suffice to describe them as short 
palmar flexors. Considered thus, each metacarpal bone, excepting the thumb, is pro- 
vided with a double interosseous muscle, the opponens minimi digiti being reckoned as 
one of these. Besides these eight, there are two superficial interosseous slips on the 
VOL. VII.—PART I. H 
