STENEOSAURUS. 



115 



the recent Crocodiles than is the case with the astragalus. It consists of a body which 

 bears on its outer side a strongly convex surface for the fibula {f.f.) ; this is separated 

 by a deep notch from the facet for the astragalus, which looks forwards and inwards. 

 Distally there is a nearly flat surface (cub.f.) for articulation with the distal tarsal 

 (cuboid). Posteriorly the bone is produced into a tuber calcis (i.e.), the neck of which 

 is narrowed, while distally it expands and bears a large roughened surface looking 

 outwards and backwards. 



Text-fig. 47. 



Left hind foot of Steneosaurus leedsi : A, dorsal surface of foot ; 13, proximal surface of astragalus and 



calcaneum ; C, distal surface of astragalus and calcaneum. (E. 3806, | nat. size.) 



a., astragalus ; c, calcaneum ; cub., cuboid ; cub.f., facet for cuboid ; //., facets for fibula ; 



mt.f., facet for metatarsal ; t.c, tuber calcis ; t.f., facet for tibia ; I-V, metatarsals. 



Another small bone belonging to the hind foot seems to be the postaxial tarsal of 

 the distal row {cuboid). On its proximal surface there is a facet for union with the 

 calcaneum, while distally there is a convex surface divided by a low antero-posterior 

 ridge, on either side of which there is a pit for a ligament. Posteriorly, the bone 



Q2 



