PROFESSOR OWEN, ON THE RHYNCHOSAURUS. 369 



m Mastoid. 

 I Temporal. 

 n Parietal. 

 o Supra-occipital. 

 q Bifurcated process of Parietal. 

 r Tympanic. 



Lower Jaw. 



a Dentary piece. 



b Opercular ditto. 



d Articular ditto. 



e Angular ditto. 



/ Coronoid ditto. 



Platk VI. 



Vertebra and other Bones of the Rhynchosaurvs artjceps. 



Fig. 1. Chain of five dorsal vertebrae, vertically bisected, shewing the concave 

 articular surfaces, and the ventricose spinal canal. 



2. Opposite and more mutilated side of the same chain, with a portion of 

 the ilium. 



3. Upper view of an entire dorsal vertebra. 



4. Upper view of fig. 1, shewing the grooved ribs. 



5. A chain of caudal vertebra?. 



6. A portion of the left ramus of the lower jaw. 



7. A chain of vertebra?, with ribs ; fragment of Scapula, Radius and Ulna. 



8. Right scapula. 



8. a. Corresponding bone of the Hylasosaurus much reduced, shewing a 



similar process from the acromion. 



9. Part of the coracoid a, the clavicle, and humerus b. 

 10. Part of the ilium, and o'f both femora. 



All the parts of the Rhynchosaur are of the natural size. 



