PLIOSAUKUS. 



19 



(Quart. Journ. Geol. Soc. vol. xlvi. (1890) pi. v. fig. 4), are very similar in form to the 

 tibia aDd fibula, but a little less elongated ; they articulate with one another proximally 

 and distally, but are separated in the middle by an oval vacuity. The radius is longer 

 than wide ; in the ulna the reverse is the case. Distally these two bones articulate 



Text-fiv. 7. 



Pubes and iscbia of Pliosaurus ferox. (R. 3536, -jL nat. size.) 

 acet., acetabulum ; il.f., facet for ilium ; is., ischium ; pu., pubis. 



with at least three elements, the radiate, intermedium, and ulnare, and probably there 

 was also a postaxial accessory ossicle. There are three distal carpals and, as usual, 

 the fifth metacarpal articulates with the ulnare. The metacarpals are much com- 

 pressed on the plane of the paddle, the phalanges rather less so, so that they are 



d2 



