hd 



Sauropsida: Class Aves 

 .If 



513 



ti.ls 



-ts.mtts 



ph.4 



Fig. 402. Columba livia. (A) Bones of the left hindlimb. (en. pr) Cnemial process; 

 (fe) femur; (fi) fibula; (hd) head of femur; (mtts. 1) first metatarsal; (pal) patella; 

 (ph. 1) phalanges of the first digit; (ph. 4) phalanges of fourth digit; (li. Is) tibio- 

 tarsus; (tr) trochanter; (ts. mils) tarso-metatarsus. (From Parker and Haswell: 

 "Text-book of Zoology." By permission of The Macmillan Company, Publishers.) 



(B) Left tarso-metatarsus of an unhatched embryo, with the distal end of the 

 tibio-tarsus; dorsal view. (X 5). The tarsal cartilages (tl 1 , tl 2 ) are represented as 

 separated from the tibia and metatarsus respectively. The cartilaginous parts are 

 dotted, (mtl 2 , mil 3 , mil 4 ) Second, third, and fourth metatarsals; (ti) tibia; (tl 1 ) 

 proximal tarsal cartilage, afterward fusing with tibia; (tl 2 ) distal tarsal cartilage, 

 afterward fusing with metatarsus. (From Parker: "A Course of Instruction in 

 Zootomy." By permission of The Macmillan Company, publishers.) 



