sinus would be brought well into view. This sinus lias 

 opening into it the temporal canal from above [30], the 

 zygomatic foramen in front laterally [67] and the jugular 

 canal : , »2 , medial to this and further forward. 



in its passage across the tympanic portion of the cavity, 

 above the columella auris, the jugular vein is invested by 

 reflexions continuous with the two septa. 

 Bibliography. 



1. Owen, R. — Anatomy of Vertebrates, London 1866. 



2. Huxley, T. H.— Anatomy of Vertebrate Animals; 



Oroonian Lecture, Proc. Roy. Soc, 1858. 



3. Hoffmann, O.K.— Bronn's Ivlass.u.Ord.des Thier-Reichs. 



Reptilien I, Schildkroten. 



4. Hasse, O.— Anatomische Studieu 2, Heft. 1871. (I have 



not seen this work, and quote it only from Hoffmann.) 



5. Parker, W. K.— The development of the Skull in the 



Green Turtle Chelone miihts, Sci. Rep. "Challenger 

 Exped." Zool. Vol. I. 

 Fig. Explanation of Figures. 



1. Left praeuaaxilla, lateral aspect. 



2. Left praemaxilla, inferior aspect. 



3. Left praemaxilla, medial aspect. 



1. lamina nasalis 5, facies sagittalis 



lamina palatina 



7 8 ; 



facies palatina 

 facies vomeris 



ft maxilla, medial aspect. 







ft maxilla, superior aspect. 







lamina alveolaris 



9. 



facies nasalis 



processus praefrontalis 



10. 



facies praefrontalis 



processus palatinus 



11. 



facies palatinus 



margo praemaxillaris 



12. 



agger masticatorius 



facies jugalis 



13. 



facies orbitalis 



margo nrUtalis (laminae 



14. 





alveolaris) 



15. 





margo nasalis 



16. 



facies praemaxillaris 



maruo orhitalis (processi 



17. 



margo vomeral is 



prefrontalis) 



18. 



margo palatinus 



