68 MARINE EEPTILES OE THE OXFOED CLAY. 



Ilium : length 187 



■width of upper end 9-6 



„ middle of shaft 4-2 



„ articular head 7"9 



Eemur: length 43-4 



R. 2438 (Leeds Coll. 2). Atlas, axis (text-fig. 15), and nineteen other cervical vertebrae, two pectorals, 

 twenty-four or -five dorsals, and eighteen or nineteen caudals, numerous cervical and 

 dorsal ribs, imperfect scapulae and coracoids, humeri, ilia (text-fig. 25, B),pubes, ischia, 

 and femora. Most of the vertebrae are greatly crushed and have lost the arches and in 

 the cervical region the ribs ; a few of the cervicals, however, are only slightly distorted 

 and retain their arches ; some caudal centra are likewise in good condition. The 

 scapulae and coracoids are much crushed and are imperfect ; the humeri are nearly 

 complete, though much crushed. In the pelvis the ilia (text-fig. 25, B) are in very good 

 state of preservation, and the ischia, though flattened and broken in all directions, seem 

 to be nearly complete ; the pubes are not complete ; the femora are nearly complete, 

 but much flattened. 



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



tt , , Atlas and , . . . , Middle Middle Posterior Anterior 



Vertebrae a •„ Anterior cervicals. „ • i ■ i • i i i 



Asis. cervical, cervical. cervical. dorsal. 



Length in mid-ventral line .... 7-0 2-7 3-3 3-7 2-7 2-5 3-6 



Width of posterior face of centrum . . 4-4 5-2 5 - 4 5 - 5 5*2 3-3 7"0 



Height of posterior face of centrum . 4-5 4*3 4-8 .. 4 - 8 3-2 6-8 



„ to tip of neural spine .... 9 - 3 . . . . 17 - 6 



Humerus : length . 38-2 



width of upper end 11-2 



„ shaft at narrowest 8 - 5 



„ distal expansion 22-0 



Hium (text-fig. 25, B) : length 20-6 



W idth of upper end 12-5 



„ shaft at narrowest .... 4 - 



„ lower articular end .... 8'3 

 Pubis : width between outer augle of acetabulum and the 



symphysial border 32 - 8 



width of articular head 17 - 



Ischium : greatest length 48 - 



width 26-3 



width of articular head 11 "7 



„ neck 9-2 



„ middle of expanded blade . . (approx.) 17"0 



Owing to the crushing and distortion which this skeleton has undergone, many of the 

 above measurements can only be regarded as rough approximations. 



E. 2444 (Leeds Coll. 8). Fragments of skull, nearly complete mandible, six centra of dorsal 

 vertebras, fragments of ribs, almost complete and little crushed right coracoid and 

 scapula. 



