188 
TERTIAET VERTECEATA OE THE EAYtM. 
plantar surface. Beneath it the outer surface of the hone is deeply excavated. The 
distal (ialcaneal facet [calc.') is large and fiat, looking outwards and a little downwards. 
The ditnensions (in centimetres) of the specimen above described are : — 
Greatest length 7'G 
AVidth of proximal articulation 3'5 
„ distal articulation 3'8app. 
,, sustentacular articulation 2 7 
C. 8388, C. 9004, 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. 
Eight astragalus of Ancodon fjorrinrjei-. A, from behind ; B, from outer side. 
distal calcaueal facet ; c\d)., facet for cuboid ; ec<., ectal facet (divided into two) ; i.c., proximal inner 
condyle ; 7i«y., facet for navicular ; o.c., proximal outer condyle ; sus., sks.', outer and inner portions of 
sustentacular facet. nat. size. 
M. 8432. Right calcaueum, wanting the tuhcn- calcis. The sustentaculum is large ; it hears two 
facets, a larger outer one, concave from before backwards, and looking uj)wards, and a 
smaller inner one looking upwards and inwards. The ectal facet is also divided into 
a larger posterior jiortion looking inwards, and a smaller anterior portion looking 
upwards and se[)arated from the large fibular facet by^ a notch. On the outer side ol 
the bone, beneath the fibular facet, there is a deeji fo-ssa, hounded below by a broad 
ridiro, wliicli runs forwards to the lower end of the bone, and at the same time forms 
O / ' 
the ujiper limit of a broad longitudinal groove which runs along the distal half of tin* 
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 hono much 
