Plerosauria. 

 PLATE 18. 



Pi a. 



1. Outer side view of part of left mandibular ramus, with teeth, of Pterodactylus 



sagittirostris. 



2. Outer side view of part of right ramus of the same mandible. 



3. Upper view of the same specimen. 



4. Inner side view of part of the left mandibular ramus of ditto. 



5. Outer side view of articular part of the right mandibular ramus of ditto. 



6. Upper view of the same specimen. 



7. Inner side view of the same specimen. 



The above figures are of the natural size. 



8. Reduced upper view of the same specimens, with conjectural restoration, in dotted 



outline, of the form or proportions of the entice mandible of IHerodactylus 

 sagittirostris. 



This fossil, from the Hastings series of the Wealden, west of St.-Leonard's-on-Sea, 

 Sussex, is in possession of its discoverer, Samuel H. Becldes, Esq., F.R.S. 



