ANATOMY OF THE LEMUROIDEA. 47 
The next one springs from the radial side and superficial surface of the deep flexor 
tendon of third digit, and is inserted into the radial side of the same digit. 
The third springs from the radial side of the tendon of the next digit, and is inserted 
into the same side of the same, or fourth digit. 
The fourth arises from the ulnar side of the tendon going to the fourth digit, and is 
inserted into the radial side of the fifth digit. 
In LZ. varius and L. xanthomystax they are also strong and well developed. ‘The 
third lumbrical muscle comes more from the surface and between the fourth and fifth 
tendons, and not alone from the radial side of the fourth digital tendon. 
As far as can be judged from the figure given by Cuvier’, the lumbricales of his 
specimen, Z. varius, appear to agree with the conditions of our LZ. catta. 
In Galago crassicaudatus the lumbrical muscles are four in number, and arise and 
are inserted on the radial sides of the deep flexor tendons (PI. II. fig. 3, L', L?, L, L’, 
and Pl. IV. fig. 14, L', L?, L’, L‘). 
In G. allenii we did not find the first of the above-described four lumbricales in Z. 
catta; but the three present corresponded to the three last of Z. catta. 
In Nycticebus tardigradus there are four radially inserted lumbricales?. 
In Perodicticus* there are but three lumbricales. 
There are four lumbricales in Twrsius‘ which spring from the radial sides of the 
flexor tendons. 
In Cheiromys we only find three, the first springs from the ulnar side of the flexor 
tendon of the index, and is inserted into radial side of the third digit. The second one 
springs from the radial side of the tendon of the fourth digit, and is inserted into the 
same side of that digit. The third one springs from the ulnar side of the tendon of the 
fourth digit, and is inserted into the radial side of the fifth digit. 
The ABpuctor POLLICIS is not very distinct, its inner side being so closely connected 
with the outer part of the flexor brevis. It arises from the annular ligament external 
to the tendon of the flexor carpii radialis, and from the sesamoid bone in front of the 
trapezium. It is inserted into the base of the outer side of the first phalanx of the 
pollex. 
In LZ. varius’ and L. canthomystax the abductor pollicis arises from the ossicle outside 
the trapezium. 
Figured in Galago crassicaudatus (Pl. II. fig. 3, and Pl. IV. figs. 14 & 15, Ad. p). 
It is well represented by Burmeister in Tarsius, tab. 5. fig. 4, no. 41. 
ADDUCTOR POLLICIS®.—This is a large and powerful muscle arising from the whole 
length of the third metacarpal bone and from the fascia on the palmar surface of the base 
of the second metacarpal. It is inserted with the inner part of the flexor brevis pollicis. 
* Pl. 68. fig. 2, 9. 2 P. Z. 8. 1865, p. 247, fig. 4. * Loe. cit. p. 36. 
* Loc. cit. p. 65, tab. 3. fig. 3, no. 47. ° Figured by Cuvier, pl. 68. fig. 2, £. 
® Recueil, pl. 68. fig. 2, p. 
