188 



TEETIAET VERTEBRATA OE THE FATtTM. 



plantar surface. Beneath it the outer surface of the bone is deeply excavated. The 

 distal calcaneal facet (calc.) is large and flat, looking outwards and a little downwards. 

 The dimensions (in centimetres) of the specimen above described are : — 



Greatest length 7'6 



Width of proximal articulation 3'5 



„ distal articulation 3"8app. 



„ sustentacular articulation 2'7 



C. 8388, C. 9004j C. 9043-4, C. 9276. Eight astragali. 



C. 8431. Two right astragali, rather smaller than M. 8507. 



C. 8412. Left astragalus. 



M. 8431a, M. 8507. Left astragali. 



C. 8810. Left astragalus, from highest beds. 



Text-fig. 61. 



A. U: 



B. 



SV& i 



Eight astragalus of Ancodon gorringei : A, from behind ; B, from outer side. 



mlc. distal calcaneal facet ; cub., facet for cuboid ; ect., ectal facet (divided into two) ; i.e., proximal inner 

 condyle ; nav., facet for navicular ; o.c, proximal outer condyle ; sus., sus.', outer and inner portions of 



sustentacular facet. 



^ nat. size. 



M. 8432. Right calcaneum, wanting the tuber colds. The sustentaculum is large ; it bears two 

 facets, a larger outer one, concave from before backwards, and looking upwards, and a 

 smaller inner one looking upwards and inwards. The ectal facet is also divided into 

 a larger posterior portion looking inwards, and a smaller anterior portion looking 

 upwards and separated from the large fibular facet b}-- a notch. On the outer side of 

 the bone, beneath the fibular facet, there is a deep fossa, bounded below by a broad 

 ridge which runs forwards to the lower end of the bone, and at the same time forms 

 the upper limit of a broad longitudinal groove which runs along the distal half of the 

 outer face. The anterior astragalar facet is flat and looks nearly inwards ; the cuboid 

 facet obliquely truncates the distal end of the bone. On the whole, this bone much 



