152 PROCEEDINGS OF THE ACADEMY OF [1888. 



The leg in each case was disarticulated at the knee and ankle, and 

 the crus thus obtained cleared from fascia and the extrinsic ham- 

 string muscles. The test was perhaps not entirely fair, as the cat 

 was probably older in proportion than the bear, but it was quite a 

 spare specimen and cannot have much increased the proper differ- 

 ence. 



The results were as follows: 



100 % 



A large muscular cat gave 43*5 % for the gastrocnemial system 

 and 28'5 % for the gastrocnemius, so the difference is not great. 

 In the above examples, it will also be seen that in the bear the 

 gastrocnemius constitutes 40 % of its own system, while in the cat 

 it is 66-5 %. 



Foot. Extensor hrevis digitorum divides into three muscular 

 bellies, of which the outer one sends a tendon to the outer side of the 

 4th digit, the next divides into two tendons which supply the inner 

 side of the 4th and the outer side of the 3rd, and the third siiuilarly 

 divides to supply the outer side of the 2nd and the hallux. As 

 usual, the peroneus quinti digiti takes the place of the short extensor 

 in the 5th digit. 



Flexor hrevis slips to the index and medius come from a muscular 

 belly, but on the outer side, the muscle has degenerated into a broad 

 thick aponeurosis, so that the tendons to the 4th and 5th do not run 

 back into muscle, but are continuous through this fibrous mass with 

 the plantaris tendon. 



Accessorius rises on the posterior and external edges of the calca- 

 neum and inserts on the deep flexor tendon formed by the union of 



