370 



GENERAL ZOOLOGY 



caudal region (Fig. 192, 8) are more or less united. There 

 are several pairs of ribs (Fig. 192, 13). The caudal vertebra 

 are terminated by a peculiar bone called, from its shape, 

 the plowshare bone (Fig. 192, 9). The shoulder-girdle is 



l j 



18 



17 



-5 



16 



15 10 



19 



20 21 22 



7 



14---- 



23 



2? 26- , 



FK 



Skeleton of Pigeon. Reduced 



skull; 2, cranium; 3, upper mandible; 4, lower mandible; 5, cervical (neck) 

 vertebra;; 0, thoracic region; 7, pelvic region; 8, caudal region; 9, plow- 

 share bone ; 10, scapula ; 11, coracoid ; 12, keel of sternum ; 13, ribs ; 14, clav- 

 icles (wish-bone); 15, humerus ; 10, radius; 17, ulna; 18, thumb; 19, wrist 

 and hand bones (carpometacarpus) ; 20, bone of third finger; 21, bone of 

 second finger; 22, end bone of second finger; 23, femur; 24, tibiotarsus; 

 25, fibula ; 20, ankle and foot (tarsometatarsus) ; 27, bone of first toe ; 28, bone 

 of second toe 



