200 MARINE EEPTILES OF THE OXFOED CLAY, 



E. 2418 (Leeds Coll. 40). Portion of the skeleton of a large adult individual. The parts preserved 

 are two cervical vertebrse, two pectorals, eighteen dorsals (text-figs. 81, 82), eleven 

 sacrals and anterior caudals, some portions of dorsal and caudal ribs, the left ilium. 

 In the vertebrte the neural arches are already fused to the centra, and the same is the 

 case with most of the cervical and caudal ribs. The neural spines are much abraded. 

 The ilium is imperfect at its upper end. 



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



Vertebrse 



Length of centrum in 



Posterior 

 cervical. 



Pectoral. 



Anterior Middle dorsnls. 

 dorsal. figured. figured. 



Posterior 

 dor3:il. 



Sacral. 



Anterior 

 caadais. 



mid-ventral line . . 



4-0 



4-8 



4-8 5-3 4-9 



4-7 



4-2 



4-2 3-7 



Width of posterior face 















of centrum .... 



6-5 



57 



6-2 6-4(app.) 6-3 



6-9 



7-0 



6-7 6a 



Height of posterior face 















of centrum .... 



0-2 



5-S 



5-3 6-2 5-7 



5 '5 



5-2 



5-3 4-7 



Width between the 















outer ends of the 















transverse processes . 







14-0(.app.) 15-3 



10-7 







Ilium 



: length 

 width ( 









24-0 

 4-2 







jf middle of shaft 







E. 3538. A nearly complete and very slightly crushed shoulder-girdle of an adult individual. In 

 this specimen there is a small interclavicle fitting in between the clavicles (text-fig. 88, 

 A, B). The latter have the median border more elongated than usual and the 

 posterior border is deejjly concave. Anteriorlj- the clavicles project considerably in 

 advance of the ventral rami of the scapulte : the roughened surface at their outer 

 angles for union with a corresponding surface on the anterior border of the scapula3 is 

 well developed and fits closely against the opposing bone. The interclavicle is less 

 regular in form than might be supposed from the figure ; the bifurcation at the upper 

 end is asymmetrical, the left side being larger than the righl ; the whole bone is curved 

 somewhat with the concavity on the right side : these irregularities seem to result from 

 the fact that the element is on the point of disappearing ; possibly it may have 

 occurred wuth other shoulder -girdles of this species, having escaped notice owing to 

 its small size and irregular form. 



The dimensions (in centimetres) of this specimen are :—; 



y 



Shoulder-girdle : greatest length . 65-5 



Clavicles: length of median (symphysial) border .... 14-9 



„ anterior border 19-0 



,, posterior border (in straight line) . . 11-2 



Interclavicle: length 10-1 



width at point of bifurcation l-S 



greatest width of anterior branch .... 1-5 



Scapula : greatest length 28-8 



length of median border 17-4 



