264 



THE VERTEBRATE SKELETON. 



FIG. 48. 



-20 



A, BIGHT ANTERIOR, AND B, BIGHT POSTERIOR LIMB OF A YOUNG 



ALLIGATOR (Caiman latirostris). (Brit. Mus.) 

 A x 4. B x about i. 



1. humerus. 10. 



2. radius. 



3. ulna. 11. 



4. radiale. 12. 



5. ulnare. 13. 



6. pisiform. 14. 



7. patch of cartilage representing 15. 



carpalia 1 and 2; between 



it and the radiale should be 16. 



another flattened patch, the 17. 



centrale. 18. 



8. carpalia 3, 4, and 5 (fused). 19. 



9. first metacarpal. 20. 



21. 



proximal phalanx of second 

 digit. 



second phalanx of fifth digit. 



femur. 



tibia. 



fibula. 



tibiale, intermedium and cen- 

 trale (fused). 



fibulare. 



tarsalia 1, 2, and 3 (fused). 



tarsalia 4 and 5 (fused). 



first metatarsal. 



ungual phalanx of second digit. 



fifth metatarsal. 



