540 lift, *. li. BfiDDAltD Olf THU [Apr. 21, 



The bicepsia large and fleshy, about an inch across at its origin. 

 Tlae tendinous sling through which it passes to its insertion is 

 formed of two strong ligaments attached to the femur ; one of them 

 is identical with the head of the gastrocnemius. In addition to 

 these two, there is a broad coarsely fibrous band running from the 

 bottom of the loop to one of the flexors of the foot. 



The ambiens, the femorocaiidal, and the accessory semitencUnosus 

 are absent. 



The accessory femorocaudal is a thin muscle tendinous at both 

 origin and insertion. 



The semitencUnosus and the semimembranosus appear to form one 

 intimately conjoined muscle, which gives ofi before its insertion a 

 very delicate tendinous slip to tlie gastrocnemius. 



Only one peroneus is present in JEchmophorus. The origin 

 of this overlaps that of the tibialis anticus. The tendon in which 

 it ends is inserted into the mass of flbro-cartilage at the ankle 

 through which the flexor tendons bore their way. 

 . The tibialis anticus has a tendon which is bifid at its insertion ; 

 just in front of the point at which the tendon divides, a tendinous 

 slip is given off which runs for some way down the foot and is 

 finally fixed to skin. 



The extensor communis diyitorum divides into three tendons for 

 the toes. That supplying digit II. remains a single tendon. The 

 tendon supplying digit III. divides into three separate tendons ; 

 while the tendon supplying digit IV. divides into two. 



The (jasirocnemius has the usual three heads. The inner is 

 much the largest, and its origin commences at the very summit of 

 the great cnemial crest of the tibia and extends halfway down the 

 leg. The outer head arises, as has been already mentioned, in 

 common with the tendinous sling of the biceps. These two heads 

 end in tendons at precisely the same level below. Shortly after 

 this (about J inch) they join. The third head arises in common 

 with the tendinous insertion of the outer of the two adductors ; 

 its tendon (ossified) joins that of the inner head some way in front 

 of the junction of the inner and outer heads. 



Flex-ores perforati. — There are the usual three muscles supplying 

 the three digits. Their tendons are not connected with each other, 

 or with the tendons of the flexor perforatus et perforans, in any 



Flexor perforatus et perforans. — Only one digit (III.) is supplied 

 by this. The tendons of the flexor profundus digitorum and of 

 the flexor longus hallucis are intimately fused for a considerable 

 length. From the conjoined tendon no slip is given off to the 

 hallux. Each of the other digits has its own slip. The tendon 

 supplying digit II. arises first ; then the remaining part of the 

 tendon divides into two, each half supplying digits III. and IV. 



§ Comparison of iEchmophorus with other Oolymbi. 

 My information as to the myology of other Grebes is derived 



