86 



2. M. bicipiti accessorius.'* 

 This muscle is represented by 

 a long slender slip, intimately 

 associated with the biceps, two 

 feet in length, passing from the 

 os calcis to the posterior point 

 of the sacrum. It is shown at 

 k, Tig. 14. 



3. M. agitator caudce weighs 



6 J oz. 



Origin from 1st, 2nd, and 

 part of 3rd caudal vertebrae. 



Insertion, by a long tendon 

 into the outer side of the patella. 

 This muscle is shown at c, Pig. 

 14. Its use is to wag the tail 

 in a feline, not canine fashion ; 

 and also to secure the proper 

 action of the patella preparatory 

 to a spring. This seems to be 

 the final cause of the violent 

 agitation of the tail, vibrated 

 from its first and second ver- 

 tebrae, that forms so remarkable 

 a characteristic of all the Felines. 

 Considered from this mechanical 

 point of view, the function of 

 the agitator caudce in the Lion 

 is similar to that of the rectus 

 femoris in the Ostrich. 



4. If. semiten&inosus (g, Fig. 

 14), weighs, . . . 10 oz. 



Origin from tuber ischii. 

 Insertion, at upper point of 

 trisection of the tibia. 



5. If. semimembranosus (h, 

 Fig. 14), weighs . . 26^ oz. 



Origin, from tuber ischii. 



Insertion, into head of tibia, 

 with a broad fascial insertion 

 above and below the knee joint, f 



Fig. 13. 



LEJT LEG OF LION. 



(with skin removed, showing superficial layer of 

 muscles). 



A, M. agitator caudce. 



B, M. Mceps femoris. 



c, Crest of the ilium. 



d, Tendinous insertion of posterior fibres of bi- 



ceps, round tendo Achillis. 

 E, Tuber ischii. 

 r, Patella. 

 G, M. semitendinosus. 

 h, Great trochanter. 



* It was suggested to me by Mr. Little that this muscle was the representative of the 

 plantaris ; and as I had found it to occur in the Dog and Badger, I was disposed to 

 regard it as the representative of this muscle in the Carnivores. I am compelled to 

 abandon this view from the observation of the fact, that in the Otter, in which animal 

 also it is found, there is a well-marked plantaris occupying its usual position in the calf 

 of the leg. 



f For details, vide Fig. 15. 



