TAB. I. 



Genus Pterodactylus. 



Fig. 



1. Fore part of the upper jaw of Pterodactylus Sedgwickii : a, side view; b, under 



view, or palatal surface ; c, front view or end ; d, section of fractured 

 opposite end. 



2. Fore part of the lower jaw of Pterodactylus Sedgwickii: x, side view; b, upper 



view ; c, section of fractured end ; d, one of the sockets, magnified, showing 

 the protruding apex of a young successional tooth. 

 3 Fore part of the upper jaw of Pterodactylus Fitioni : a, side view ; b, under 

 view ; c, section of fractured end. 



4. Another portion of the upper jaw of Pterodactylus Fittoni .■ a, side view; b, section. 



5. A fragment of the upper jaw with one socket of Pterodactf/lus Fittoni : a, 



under view; b, outside view; c, inside view, showing the large cancelli. 



6. A fragment of the upper jaw of a large Pterodactylus Sedgwickii : a, under view ; 



b, end view, showing the deep implantation of the tooth ; c, outside view. 



7. Part of the under jaw of Pterodactylus Sedgwickii: a, side view; b, upper 



view, or that next the mouth ; c, under view ; d, section, 



8. Base of a tooth, impressed by the apex of a successional tooth, at o. 



9. Crown of a tooth. 



10. Base of a large tooth, showing the longitudinally wrinkled cement. 



1 1 . Anchylosed atlas and axis : c, centrum of atlas ; ex, centrum of axis ; b, articular 



ball of axis ; p, inferior process ; o, pneumatic foramen ; w, neurapophysis 

 of atlas ; tix, neural arch of axis ; c, posterior zygapophysis and tubercle of 

 axis. 



12. Section of anchylosed atlas and axis: h, median hypapophysis. 



13. Front view of the axis vertebra from which the atlas has been detached, 



14. Back view of the same vertebra. 



All the foregoing figures are of the natural size, and from specimens in the 

 Woodwardian Museum of the University of Cambridge (with the exception 

 of fig. 7 in the Private Collection of the Rev. G. D. Liveing, M.A., of St. 

 John's College, Cambridge) ; they were obtained from the Upper Geen-sand 

 (Neocomian), near that town. 



