1865. ] ANATOMY OF NYCTICEBUS. 253 
the possibility of the plantaris in any way contributing to form this 
so largely developed flexor longus digitorum. 
An interesting similarity with reference to the distribution of the 
tendons exists in Cheiromys', except that there is no tendon given 
off to the hallux. 
Flexor tendons of the foot. 
F.1. d. Flexor longus digitorum. /’./.h. Flexor longus hallucis. F..d. Flexor 
brevis digitorum. Z. Lumbricales. P.&. Peroneus brevis. P./. Peroneus 
longus. P.g.d. Peroneus quinti digiti. T.a. Tibialis anticus. £./.h. Ex- 
tensor longus hallucis. 
The flexor longus hallucis is a powerful muscle, but smaller than 
the preceding. It arises by two heads—one from the posterior sur- 
face of the fibula, the other, a very small fasciculus, from the tendon 
of the popliteus (fig. 5). Its strong tendon gives off a slip to the 
hallux, joining that going to the same digit from the flexor longus. 
Jt then bifurcates, one part joining that branch of the flexor longus 
which goes to the index and middle digits, and forms its share of 
each of their tendons ; the other joins a tendon of the flexor longus, 
and forms with it the perforating tendon of the fourth digit (fig. 6, 
F.1.h). 
A oa similar arrangement exists in Chetromys* ; only this muscle 
exclusively furnishes the hallux-tendon. 
The flexor brevis digitorum is very narrow; it arises from the 
plantar surface of the tendon of the flexor longus, and ends in two 
' Owen, Joc. cit. p. 67, pl. 25. fig. 2. no. 32. ? Ibid. no. 31. 
