ANATOMY OF THE LEMUROIDEA. 85 
of the deep flexor tendon, and forming the other half of the perforated tendon of the 
third digit and the whole of those of the fourth and fifth digits. 
In Cuvier’s figure of Lemur varius, pl. 70. fig. 3, this muscle also seems to consist of 
two portions similar to those above described by us; but the part springing from the 
plantar fascia and supplying the perforated tendon of the index is not represented as 
furnishing any tendon to the third digit, while its fleshy belly is not separated from 
those of the abductors of the hallux and fifth digits respectively, the whole being 
marked « and named “ court fléchisseur commun” (calcanéo-sous-onguien). The other 
part, which springs from the deep flexor tendons, supplies the perforated ones of the 
third, fourth, and fifth digits; it is distinguished by = and is the “lombricaux ( planti- 
sous-phalangiens).” 
‘The arrangement which we have found in the Thick-tailed and Garnett’s Galago is 
a kind of modification between G. allenii and what Burmeister describes and figures in 
Tarsius (see infra). The deepest fleshy division corresponds to Burmeister’s third 
portion (see G. crassicaudatus, Pl. V. fig. 24, F.b.d), moreover in G. garnettii supply- 
ing a perforated tendon to the second digit ; his F.b. h. superficialis is but a few very 
delicate muscular fibres on the under surface of the hallucial plantar extension (PI. V. 
fig. 24, Pf.s*, and Pl. II. fig. 5, Pfs); besides there are films of fleshy substance 
attached to the deep side of the plantar fascia where it goes to the fourth and fifth 
digits, Pl. V. fig. 24, P.f.s**, forming, indeed, almost separate muscles. Burmeister’s 
F. b. d. secundi, therefore, may either be represented by a palmar fascial slip or derived 
from the true flexor brevis. The tendency of the distribution on the whole seems to 
point to a superficial, a middle, and a deep set of flexor muscles, besides the lumbrical 
and interosseal sets. 
In G. allenii fibres arose from the deep surface of the superficial plantar fascia (con- 
tinuous with the plantaris); it was connected not only with the index but with the 
hallux. Also from the plantar surface of the deep tendon the second part arises, which 
furnishes a distinct perforated tendon to the third, fourth, and fifth digits. 
According to Cuvier', in Loris gracilis there appear to be four fasciculi going to the 
four peroneal digits. 
In Wycticebus? the flexor brevis is a small muscle, of which fasciculi arise from the 
deep flexor tendon and go to the fourth and fifth digits. 
In Zarsius® this muscle is described as consisting of three portions: the first, his flexor 
brevis hallucis superficialis (36 @), arises from the superficial plantar fascia and goes to 
the hallux; the second, his flexor brevis digiti secundi, arises from the same fascia and 
goes to the second phalanx of the index; the third portion, his flexores breves digiti 
tertii, quarti, et quinti (36 2), springs from the plantar surface of the deep flexor tendon, 
and forms the perforated tendons of the third, fourth, and fifth digits. 
1 Pl, 67. fiz. 2, «. 2 PZ. 8. 1865, p. 253, fig. 6, F.b.d. 
3 Loc. cit. pp. 80 & 81, tab. 5. figs. 8 & 9, nos. 36a & 36 b. 
