188 
TEETIAHT VERTEBEATA OE the FATtrM. 
plantar surface. Beneath it tlie outer surface of the bone is deeply excavated. Tho 
distal calcaneal facet (calc.) is large and flat, looking outwards and a little downward.^. 
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. 9004r, C. 9043-4, C. 9276. Right 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, 
Right astragalus of Ancodon ^orringei : A, from behind ; B, from outer side. 
fa/c.. distal calcaneal facet ; cid)., facet for cuboid ; ecL, ectal facet (divided into two) ; i.c., proximal inner 
condyle ; nav., facet for navicular ; o.c., proximal outer condyle ; sjis., stts.', outer and inner portions of 
sustentacular facet, f nat. size. 
M. 8432. Bight calcaueum, wanting the tuber calcis. The sustentaculum is large ; it bears two 
facets, a larger outer one, concave from before backwards, and looking ujiwards, 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 fibnlar facet b}^ a notch. On the outer side of 
the bone, l)eneath tlie fibnlar facet, there is a deep fossa, hounded below by a broad 
ridge, which runs forwards to the lower end of the bone, and at the same time forms 
the u))])or limit of a broad longitudinal groove which runs along the distal half of tho 
outer face. The anterior astragalar facet is flat and looks nearly inwards ; the cuboid 
facet obli(|uely truncates the distal end of the bone. On the whole, this bone much 
