74 ilK. F. G. PARSONS ON THE 



inserted into the metatarsals of the rudimentary internal toes 

 (index and medius). 



The Peroneus hrevis rises from the fibula in front of the hist, 

 and is inserted into the base of the metatarsal bone of the fifth 

 toe (minimus). 



The Peroneus quinti digiti comes from the second quarter of 

 the fibula and is inserted into the dorsum of the terminal phalanx 

 of the fifth toe. It will be seen that this is the only extensor 

 tendon of the fifth toe. 



The two heads of the Gastrocnemius rise from just above the 

 condyles ; in the origin of the outer one a flabella is de^^cloped. 

 The tendons from these two bellies with that of the phmtaris 

 are twisted in the rope-like manner so often seen in raamivials *, 

 and are inserted as usual into the calcaneum. ITrom the inner 

 side of the tendon just above its insertion a curious oblique band 

 of fibres runs downward and forward to be inserted into the 

 plantar fascia ; I have not seen this in any other mammal. 



The Plantaris is larger in bulk than either head of the 

 gastrocnemius ; it rises from the flabella behind the external 

 condyle and its tendon winds round in the usual way from the 

 deep to the superficial aspect of the tendo Achillis. In the sole 

 it forms a tough fibrous sheet which divides for the 2nd, 3rd, and 

 4th toes, each slip forming a flexor perforatus and being inserted 

 into the middle phalanx. 



The Popliteus is small and has the usual attachments, it is in- 

 serted into the upper eighth of the posterior surface of the tibia. 



The Potator fihulce is so slight as to be almost unrecognizable, 

 it forms a very feeble deep layer of the last muscle ; in this 

 animal there is no movement between the tibia and fibula. 



The Plexor tibialis and Flexor fibularis rise from the upper half 

 of the tibia and fibula, their tendons fuse in the sole and 

 eventually form the flexores perforantes for the 2nd, 3rd, and 

 4th digits (index, medius, and annularis). As in tlie hand, there 

 is one lumbrical for the annularis digit. 



The Sole Muscles consist only of three flexores breves, which, as 

 usual, are double-headed ; one of these is common to the rudi- 

 mentary index and medius digits, one belongs to the great 

 annularis and one to the minimus ; this flexor brevis of the 

 minimus is the only flexor muscle of that digit. 



* " Morphology of the Tendo Achillis," Journ. of Anat. xxviii. p. 414. 



