MI 



UH> one to the radial tide, answering to that of the index-finger, is rery short ; it supporU 

 a digit of two phalange*, the second phalanx being armed with a long cunrrd and pointed 

 daw : the third mrtararpal, answering to that of the digit u* annularis, u bent, iu extre- 

 mity retting against that of the large and straight middle metacarpus, with which it tahse- 

 qMftdy bienati anchylosed : the middle digit coiuisU of three phalanges ; the outer one of 

 two phalanges. In all birds the three metacarpals, here seen to be distinct, coalesce with 

 on* another and form a single bone, baring an interesting analogy to the metatarsus, which 

 likewise consists in all birds of a coalescence of thr three bones supporting the corresponding 

 toes, namely, those answering to the second, third and fourth in the pentadactyle foot. 



llunterian. 



1368. Three cervical vertebra? of an Ostrich, articulated to show the structure of the 



joint. llunlfriiin. 



1369. The sternum of an Ostrich, with the sterno-costal bones attached on the left 

 side. //tf/cnaft. 



1370. The third sterno-costal bone of an Ostrich, right side. lluntrrian. 



1371. The sixth sterno-costal bone of an Ostrich, right side. Hunterian. 







1372. The scapular arch of an Ostrich. 



The coracoid has coalesced with the scapula, from which a broad darkle is dereloped as a 

 free process like a long acromion : it is the homologue of the half of the furculum in other 

 birds, 



Hunterian. 



1373. The left humerus of an Ostrich, in longitudinal section. Htmtcria*. 



1374. The left ulna of an Ostrich. Htmterian. 



1375. The fourth and fifth dorsal vertebrae of an Ostrich, articulated to show the 

 structure of the joint. Hunlerian. 



1376. The sixth dorsal vertebra, with the left rib, articulated. Hunierian. 



1377. The seventh and eighth dorsal vertebrae of an Ostrich. llunlerian. 



2M 



