PROFESSOR OWEN, ON THE RHYNCHOSAURUS. 365 



of the bone in question with the long spinous process of the Chelonian 

 pubis, is less close than the one just discussed. If the present well- 

 marked bone of the Rhynchosaur be regarded as a scapula, it is to 

 that bone in the Dinosauria that it offers most resemblance; and the 

 prismatic process would then correspond with the one sent off from the 

 anterior part of the glenoid articular surface in the scapula of the 

 Hykeosaur and Iguanodon. The concavity at the neck of the bone, 

 at the side opposite that from which the process extends, also gives 

 it a nearer resemblance to the Dinosaurian scapula than to the Croco- 

 dilian ischium : it differs from the scapula of the Crocodile in having 

 the posterior margin beyond the neck straight instead of convex ; the 

 corresponding margin in the ischium being concave. The blade of the 

 bone, considered as scapula, is broader and shorter than in either the Di- 

 nosaurs or Crocodiles : its outer surface is slightly convex. Supposing 

 the scapula to be placed vertically upon the thicker articular end, the 

 prismatic process is directed forwards and downwards. There are a few 

 pits or inequalities near the neck or thick articular margin in the 

 present fossil. The outer surface of the plate is marked with extremely 

 fine striae, radiating from the neck. 



In. Lines. 



Length of the bone 1 . 8 



Breadth of the neck . 5i- 



Breadth of the base 1 . 



Length of the trihedral process . 8 



Coracoid*. — The remains of a thin and broad plate of bone, attached 

 by a short neck to an apparently articular thickened head or process, might 

 be compared to a coracoid, since it resembles, so far as it is preserved, 

 the coracoid of Lizards, more than it does any other known bone ; there 

 is not, however, the perforation near the articular surface. The breadth 

 of the neck is 6 lines ; that of the body of the bone which remains 

 13 lines ; the length or diameter at right angles to the above is 10 lines. 

 The bone is thinned off to an edge, which is gently convex. 



Humerus-^. — A third bone, imbedded in the^same piece of sandstone 

 at a little distance from the preceding, is expanded at both extremities, 



* Plate vi, fig. 9, a. + Plate vi, fig. 9, c. 



Vol. VII. Paet III. Ss 



