TAB XIII 

 Oph i dm. --Recent and Fossil Ophidian Vertebra* ; nat. size. 



Fig. 



1 — 4. Vertebrae from the middle of the body of a Python. Scba, twenty feet in length. 



2/ 3'. A rib of the same Python. 



3". Section of the proximal end of a rib of the same Python, showing- the medullary 

 cavity. 



5 — 8. Vertebrae from the middle of the body of the Paleeophw typhceus. 



9 — 12. Corresponding vertebrae of a rattle-snake. (Crotalus.) 

 13 — 10. Corresponding vertebrae of a hooded-snake. (Naja.) 

 17 — 20. Corresponding vertebrae of a harmless snake. {Coluber elaphm.) 

 21 — 24. Corresponding vertebrae of an African Eryx. 

 25 — 28. Corresponding vertebrae of a sea-snake. (Hydrm tricolor.) 

 29 — 32. Corresponding vertebrae of Palcryx rhombifer. 

 33 — 30. Corresponding vertebrae of an Iguana. 

 37 — 38 Corresponding vertebra 1 of Palcryx deprcwM. 



