34 MARINE REPPILE3 OP THE OKPORD CLAY. 



Ilium (text-fig. 10) : 



LeDgth 31-0 



Width of distal end 10-2 



Femur (text-fig. 9, B) : 



Length 50-0 



Greatest width at proximal eud 15 # 



"Width of the shaft at narrowest 9'8 



., distal expansion 27'5 



R. 3170. Portions of skull, nearly complete mandible, teeth, anterior wedge-bone of atlas, numerous 

 much-crushed centra of vertebrae, including five cervicals and ten caudals ; imperfect 

 scapulae, portions of coracoids ; humeri, radius, ulna, ? ilium, femora, tibiae, fibula?, and 

 numerous paddle-bones. 



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



Skull: width of articular end of quadrate . . . (approx.) 8-7 



Mandible: length 84-5 



length of symphysis (approx.) 14'0 



width of symphysis 14 - 5 



„ behind symphysis 12-8 



„ of articular surface (approx.) 9 - 2 



Scapula : width of articular head 9-4 



,, middle of ascending ramus 4-9 



Humerus: leugth 39 - 5 



width of shaft at narrowest 8 - 8 



„ distal expansion (approx.) 22-0 



Radius : length 13-3 



width at upper end 9*7 



Ulna: length 11-7 



approx. width in middle 9-2 



Femur: length (approx.) 45-S 



width of shaft at narrowest 9'0 



,, distal expansion (approx.) 22-7 



Tibia: length 15-7 



width at upper end irO 



Fibula: length 14-1 



width in middle 10'0 



Genus PEL0NEUSTES, Lydekker. 

 [Quart. Journ. Geol. Soc. vol. xlv. (1889) p. 49.] 



Pliosaurs which are smaller than the members of the typical genus Pliosaurus. 

 Skull elongated, the premaxilke very long, each bearing six teeth. Mandibular 

 symphysis greatly elongated, bearing about 12-15 teeth on either side. Neck short ; 



