HIND-LIMB. 147 



soleus is attached to the deep surface of the outer half of 

 the gastrocnemius throughout its entire length. The 

 plantaris tendon passes from the inner to the plantar 

 surface of the spirally twisted tendon of the gastrocnemius. 

 0. C. 64 z k. Presented by F. J. Bennett, Esq. 



C. 207. The distal portion of the left hind-limb of a Koala 

 (Phascolarctus cinereus], showing a powerful pronator 

 muscle of the shank. It- arises from the anterior border of 

 the inner side of the head and shaft of the fibula, and passes 

 diagonally downwards to be inserted upon the posterior 

 border of the outer side of the tibia. The head of the fibula 

 articulates with that of the tibia by means of a small facet, 

 allowing of limited motion in an antero-posterior direction. 

 The contraction of the muscle produces a movement of 

 pronation by drawing the fibula obliquely across the tibia. 

 The muscle is usually regarded as a fusion of the popliteus 

 with the pronator tibiae. Two of the short extensors 

 (i. e. IV. & V.) (Peroneus quinti and quarti digiti) rise from 

 the fibula. 0. C. 64 z k b. 



Presented by Prof. G. B. Plowes. 

 Young, Jour. Anat. & Physiol., vol. xv. 1881, p. 392. 



C. 208. Lower part of the right hind-limb of an Armadillo 

 (Dasypus senccinctus}, showing the peronei muscles. The 

 peroneus brevis arises from the femur as well as from the 

 fibula. The p. longus has an additional origin from the 

 patella. The tendon of the peroneus longus before crossing 

 the sole in the usual way, has a strong insertion upon the 

 base of metatarsal v. 



Galton, Trans. Linn. Soc., vol. xxvi. 1870, p. 559. 



C. 209. Nerves and superficial muscles of the right hind-limb of 

 an Anteater (Myrmecopliaga jubata) . The muscles of the 

 thigh, more especially those upon the flexor surface, are 

 notable for their strength, as well as for a marked tendency 

 to subdivision ; thus, the caudal and ischial heads of tho 

 semitendinosus are entirely separate, and the semimem- 

 branosus and gracilis are each represented by two distinct 



L2 



