EXPLANATION OF THE PLATES 



All figures in the plates are from photographs by the author; direct from the 

 specimens and reduced about one-third. 



PLATE 1 



EXPLANATION OF FIGURES 



1 Right lateral view of the first five vertebrae of the neck (cervicals) from an 

 adult specimen of Testudo ephippium. 1, at., atlas; 2, b.ax., body of the axis 

 or second cervical vertebra; 3, third cervical; 4, fourth cervical, and 5, fifth cer- 

 vical vertebrae. No. 59867, Coll. U. S. Nat. Mus. 



2 Right lateral view of the first*four vertebrae of the neck (cervicals) from 

 an adult specimen of the hawksbill turtle (Eretmochelys imbricata). Lettering 

 as in figure 1. No. 59866, Coll. U. S. Nat. Mus. 



3 Right lateral view of the leading ten free vertebrae in the neck of an adult 

 specimen of Amyda cartilaginea {1 to 10). o, the odontoid process of the second 

 or axis vertebra. No. 029550, Coll. U. S. Nat. Mus. 



224 



