TAB. XXVII. 



Fig. 



1. Skull of Pterodactylus longirostris (after Collini). 



2. Left side of the skull of Pterodactylus crassirostris. 



3. Right side of the same skull. 



4. Restoration of the same skull (after Goldfuss). 



5. Restoration of the skull of Pterodactylus compressirostris. 



The tinted portions of fig. 5 are from the Middle Chalk of Kent, and are in the 

 Museum of James Scott Bowerbank, Esq., F.R.S. 



