190 MAEINE EEPTILES OF THE OXFOED CLAY. 



Fossil Eeptiles, is probably the most nearly complete skeleton of an Elasmosaurian 

 Plesiosaur known : the description of the skeleton given above and the restoration in 

 text-figure 94 are founded mainly on it. 



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



Total length of the skeleton as mounted . . about (11 ft.) 33o'0 



Skull (PL IX. figs. 1-3) : 



Length of basioccipital 3'5 



Width of basioccipital at pterygoid processes 4-6 



Transverse diameter of occipital condyle 2-4 



Height from bottom of basioccipital to vertex of skuU . . 8-6 



Length of paroccipital processes (approx.) 2-6 



Width of articular surface of quadrate 3'1 



Atlas and -p^^^]^ Tenth Foarteenth Iwenti.th Tiventy-Bfth Thirtieth First Fifth Tenth Fifteenth First First Twelfth 

 Vertebrae ,B^'^'^fi\ cervical, cervical, cervical. cervical. cervical. cervical, pectoral, dorsal, dorsal, dorsal, sacral, caudal, caudal. 



length of centrum 



in mid - yentral 



line .... 4-2 23 2-7 3-2 3-3 3-4 35 So 40 4-2 42 4-1 33 30 



Width of posterior 



end of centrum. 2-8 2-8 3-4 3-9 4-5 5-0 6-1 4-7 



Height of posterior 



end of centrum. 2-1 2-2 26 32 3-6 40 5-0 3-7 



Height to top of 



neural spine . o'l 6-1 7 6 S'D lOS ll'O 15-5 ... 14-8 ll'O 12-2 89 



Owing to the mounting of this skeleton, complete measurements of the vertebrse 

 cannot be taken. 



Shoulder-girdle : 



Greatest length of combined scapula and coracoid .... 52-1 



„ ,, scapula 25'0 



,, ,, coracoid (approx.) 39'0 



Width of united coraeoids at posterior angle of glenoid 



cavities 34-9 



Width between outer ends of the postero-external angles of 



coraeoids 48*0 



Width of united coraeoids at narrowest point 26-7 



Length of clavicle (median border) 11-0 



Width of clavicle (median border to outer angle) . . . . 10-6 

 Fore limb : 



Humerus : length 28*5 



diameter of head 7'5 



gi'eatest width of upper end 10-9 



width of shaft at narrowest 7-0 



width of distal expansion 21-4 



Eadius : length of preaxial border 10-5 



width of surface for humerus 10-9 



TTlna : greatest length 5-6 



„ width 9-3 



