OOLITIC DINOSAURS. 



591 



surface to the astragalus, is unancliylosed, the Hue of suture closely resembling that in 

 the distal end of the present fossil. 



Of the foot-bones, " three metatarsals of each foot were secured." Tiie largest 

 appeared to be the first or innermost, the slenderest the third or outermost of the 

 series. " Perhaps there were only three metatarsals, since the specimens we possess 

 exhibit opposite pairs of three and no more" (Phillips, op. cit., p. 285). 



That these bones are homologous with those determined as the second, third, and 

 fourth of the pentadactyle foot in Scelidosaurus and Iguanodon I deem more probable 

 than that they answered to the metatarsals of the first, second, and third digits in 

 Crocodilus. 



If a first or a fifth digit existed in the hind foot of Cetiosaurus, their shortness or 

 rudimental condition may have prevented their recognition. 



Fig. 9. 



CoiacoiJ, Cetiosaurus longus, -Jj'h nat. size. (Phps., part of diagr. xcviii, p. 268.) 



In the description of the osseous characters then known of the largest species of 

 Whale-Lizard, I remarked : 



" These enormous Cetiosauri may be presumed to have been of aquatic and, most 

 probably, of marine habits, on the evidence of the coarse cancellous tissue of the long 

 bones which show no trace of medullary cavity." * 



In reference to their affinities : 



" In the great expanse of the coracoid [fig. 9] and pubic bones, as compared with the 

 Teleosaur and Crocodiles, the gigantic Saurians in question manifested their closer affinity 

 to the Enaliosauria" t — closer, that is, than the Teleosaurs or Crocodiles show ; but 

 " their essential adherence to the Crocodilian type is marked by the form of the long 



* 'Eeport,' ut supra, p. 102. t lb., ib. 



Ub 



