HIND-LIMB. 143 



C. 192. Muscles of the thigh of a King Vulture (CatJiartes papa) 

 (order Pseudogryphii, subclass Coraciiformes) . Both parts 

 of the caud-ilio-femoralis are absent. 0. C. 64 Y g. 



C. 193. Muscles of the thigh of a Hornbill (Buceros, sp.) (order 

 Picarise, subclass Coraciiformes). The ambiens, caud-ilio- 

 femoralis (pars ilio-femoris), and ilio-tibialis are absent. 

 0. C.64Y*. 



The following specimens show certain variations in the 

 arrangement and mutual connections of the deep plantar tendons 

 which are approximately constant for different taxonomic 

 groups of birds. 



Garrod, Proc. Zool. Soc. 1875, p. 330. 



C. 194. Right foot of Roller (Eurystomus pacificui): the tendon 

 of the flexor longus hallucis unites with that of the flexor 

 profundns without crossing at the lower end of the tarso- 

 metatarsus. From the common tendinous expansion 

 thus formed, individual tendons are given off to the toes. 

 0.0 64 Y*. 



C. 195. Right foot of a Laughing Jackass (Dacdo gigas). The 

 tendon of the flexor longus hallucis fuses near the distal end 

 of the tarso-metatarsus with the outer side of the flexor 

 prof undus tendon. The flexor profundus gives off tendons 

 successively from its inner side to I., II., & ill. digits. The 

 tendon for IV. arises from the point of union of the flexor 

 longus with the flexor profundus. This arrangement is 

 probably a modified form of that seen in the previous 

 specimen. 0. C. 64 Y m. 



C. 196. Right foot of a Cuckoo (Cuculus canorus). The flexor 

 longus tendon crosses superficial to that of the flexor pro- 

 fundus about the middle of the tarso-metatarsus, and at 

 this point is attached to it by fibrous bands (vincula). The 

 tendon of the flexor longus goes to I. ; that of the pro- 

 fundus to II., ill., IV. This arrangement is common to 

 many four-toed birds. 0. C. 64 Y I. 



