496 



MB. P. CHALMERS MITCHELL ON THE 



[June 19, 



these the three tendons arise in a very definite manner. That of 

 tlie fourth digit is always the most superficial ; in every case it had 

 a separate connection with each of the three heads. That of the 

 third digit lies next below ; it had origin in all but one case from 

 each of the three heads. The exception is the Pheasant, in which 

 the outer head was absent, while the head from the amhiens was 

 much more muscular than in the others. The tendon of the 

 second digit comes from the deepest part of the muscle and lies 

 nearest the fibula. In Ar amides, in Fsophia, and in Leptoptilus it 

 arose from each of the three heads ; in Hcematopus it arose from 

 the amhiens and the inner head ; in all the others from the amhiens 

 and the outer head, as in the figure of the Crane. Thus in each 

 of the nine birds the ambiens is connected with the perforated 

 flexor of each toe. 



Eig. 1. 



lemur 



biceps 



Dissection of the right leg of Balearica ckrysopelargus, seen from the outer side. 



gastr. Outer head of gastrocnemius, cut and reflected. 



Biceps. Biceps, cut across shortly after its passage through the sling. 



1. Flexor longus hallucis. 



2. Flexor perforatus indicis. 



3. „ „ medii. 



4. ,, „ annularis. 



2'. Flexor perforatus et perforans indicis. 

 3'. „ „ „ „ medii. 



In Nycticonix gardeni, as may be seen from fig. 2 (p. 497), a 

 condition very closely resembling that in the Crane is present, but 



