318 



Annals of the South African Museum. 



there is also a carpal, probably a fibulare, and a number of phalanges, 

 which cannot be placed. The femur seems to have possessed a well- 

 developed trochanter, and on the ventral face of the shaft there was 

 a rugose surface for the attachment of muscles ; distally it expanded 

 considerably (text-Fig. 4, fern.) ; indeed, its expansion seems to have 



a.z. 



FIG. SA. 



FIG. SB. 



3. Dorsal vertebrae of Plesiosaurus c^ensis .- A. from left side, B. from below. 

 <f nat. size. 



a.z., anterior zygapophyses ; n.f. and n.f.' ; nutritive foramina; n. sp.,. 

 neural spine; ./->..?., posterior zygapophysis ; t.p., transverse processes. 



been too great for articulation with the tibia and fibula only, and 

 probably it also supported a posterior accessory ossicle. The tibia 

 and fibula (text-Fig. 4, tib. fib.) are more elongated than one would 

 expect to find them in a Wealden form, and in this respect the paddle 

 much resembles that of some of the Lower Lias Ples-iosaurs, e.g.,. 

 P. hawkinsi. The tibia (tib.) articulates with the femur by a long 



