368 PROFESSOR OWEN, ON THE RHYNCHOSAURUS. 



of the skull has brought to light modifications of the Lacertine structure 

 leading towards Chelonia and Birds, which were before unknown : the 

 vertebras, likewise, exhibit very interesting deviations from the Lacertian 

 type. The entire reconstruction of the skeleton of the Rhynchosaurus 

 may be ultimately accomplished, if the collection and preservation of 

 the fossils of the Grinsill quarries be continued with the same activity 

 and care, as have already produced so important an accession to Palaeon- 

 tology through the well-directed zeal of Dr. Ogier Ward, and other 

 members of the Literary and Scientific Association at Shrewsbury. 



DESCRIPTION OF THE PLATES. 



Plate V. 

 Skull of the Rhynchosaurus articeps. 



Fig. 1. Side view. 



2. Three-quarters' view. 



3. Upper view. 



4. Front view. 



5. Back view. 



All the figures are of the natural size, and the same parts are marked with the 

 same letters in each figure. 



Cranium and Upper Jaw. 

 a Intermaxillaries. 

 b Nasal, 

 c Frontal. 

 d Maxillary, 

 e Anterior frontal. 

 / Lachrymal. 

 g Malar. 



i Posterior frontal. 



i Orbital division of ditto. 



