1865. | ANATOMY OF NYCTICEBUS. 251 
weak and slender. It arises by the usual two heads, the inner one 
being very much higher than the outer one. It has the ordinary 
insertion by the tendo Achillis, which is moderately developed, the 
gastrocnemius being muscular almost its entire length (fig. 5, G). 
The soleus appears to be represented by a flat rhomboidal band 
of muscular fibre without any tendon. It arises from the posterior 
margin of the head of the fibula and the inner border of the flexor 
longus hallucis for about half its length, then joins the outer border 
of the gastrocnemius for above half an inch (fig. 5, 8). In Loris, 
according to Meckel’, it arises from almost the whole of the fibula. 
We were unable to find any trace of a plantaris muscle. 
Hind limb between knee and ankle. 
P. Popliteus. G. Gastrocnemius. S. Soleus. F./. d. Flexor longus digitorum. 
F.1.h. Flexor longus hallucis. 7. a. Tibialis anticus. 7. p. Tibialis posticus. 
The *popliteus is rather well developed. It arises from the pos- 
terior surface of the tibia as far inwards as the internal lateral liga- 
ment (fig. 5, P). It is inserted by a very strong tendon (contain- 
ing a large sesamoid bone), which passes behind, rather than beneath, 
the external lateral ligament, into the depression outside the outer 
condyle. In Tarsius, according to Burmeister’, this muscle is in- 
1 Anat. Comp. vol. vi. p. 421, 2 Op. cit. p. 75, t. 4. fig. 5. no, 23. 
