TAB. III. 

 Skull of Chelone longiceps, nat. size. 



Fig. 



1. Side view. 



2. Top view. 



3. Base view. 



4. Back view. 



The same numerals indicate the same bones as in Tab. I. 



13, 13. Vomer. 

 20. Palatine. 

 22. Premaxillary. 

 24. Pterygoid. 



The following perishable parts are indicated by the impressions left on the bone 



Jr. The frontal scute. 



sy. The sincipital scute. 



io. The inter-occipital scute. 



oc. The occipital scute. 



ol. The occipito-lateral scute. 

 pa. The parietal scute. 



ob. The supraorbital scute. 

 Jn. The frontonasal scute. 



