66 MAEIJSTE EEPTILES OF THE OXFOED CLAY. 



stapes (1), opisthotics, squamosal, jugals, lachrymal, nasals, quadrates, pterygoid ; 

 also a considei-able part o£ the mandible, including both articular bones, and about 

 forty teeth ; hyoid bones. 



Of the skeleton there are : atlas and axis and sixty-five other vertebrae, a few neural 

 arches, numerous fragments of ribs, right clavicle, coracoids, scapulse, humeri, radius, 

 ulna, ilia, parts of ischio-pubes, femora. 



The dimensions (in centimetres) of some of the bones are : — 



Basioccipital : width of condyle 3-2 



Quadrate : extreme length 6'8 



width at neck 3-3 



length of articulation (approx.) 3'5 



Articular bone : length 3-3 



Hyoid bone : length 9-2 



width of middle of shaft 0-7 



Atlas and axis : length 1-9 



greatest width 4-6 



Middle precaudal : width 4-5 



Anterior caudal : length 1-4 



width 1-9 



Coracoid : greatest width 8-6 



Scapula : greatest length 10-2 



width of proximal expansion 6*6 



Humerus : length 7*1 



^ width of distal eud (approx.) o-4 



Ilium : length 5'3 . 



Ischio-pubis : length (approx.) 6-6 



Femur : length 4-1 



width of distal end 2-6 



E. 2740. A large part of the skull and mandible of a large individual. The bones are well 

 preserved but greatly displaced, and in part imbedded in hard matrix : a portion of the 

 sclerotic ring is preserved in situ, and the cut edges of the plates show that they are 

 closely interlocked along their edges (PL I. fig. 10). The chief parts shown are : 

 basioccipital with exoccipitals and supraoccipital attached, basisj^henoid with the para- 

 sphenoid, postero-superior portion of orbit showing the relations of the postorbitals, 

 supratemporal, the anterior wing of the squamosal, and the postfrontal to one another ; 

 the facial region with the nasals, lachrymals, maxillae, and premaxillae nearly in their 

 natural relations. The mandible is represented by'the greater part of the postsymphysial 

 region of both rami. 



Some dimensions (in centimetres) of this specimen are : — 



Basioccipital : width of condyle 7-7 



greatest width 10-9 



„ length S'5 



