GEOLOGICAL SURVEY OF THE TERRITORIES. 601 



completed by the fibula. Tbe posterior tuberosity is more nearly median 

 than usual, hence the inner margin of the inner trochlea is low poste- 

 riorly, and the inner malleolus has a considerable beveled inferior mar- 

 gin. The fihula has a slender shaft, but little compressed. The head is 

 expanded fore and aft, and the malleolus is quite stout. 



Measurements.' 



M. 



Length of tibia 0.244 



Diameter from outer angle of head to inner angle of crest 0(i5 



Diameter-^iistal end, (greatest) 035 



Diameter articular face, transverse 027 



Diameter articular face, fore and aft 026 



Both hind feet are perfectly preserved. The astragalus is rather elon- 

 gate and compressed, the lower face truncate with two longitudinal 

 bounding ridges, the outer of which is discontinued before reaching the 

 heel. The surface between them is striate grooved. The outer face is 

 slightly concave. The astragaline facets are much expanded inward ; 

 the outer is transverse and strongly convex, and separated b}^ a groove 

 from the inner, which is longitudinal and nearly plane. The posterior 

 edge of this, and convexity of the outer facets are received into a trans- 

 verse groove of the posterior part of the lower face of the astragalus. 

 The cuboid facet is diagonal, and is bounded within by a third narrow 

 facet for the astragalus. The -astragalus has a strongly convex deeply 

 grooved trochlea ; the convexity extends over 158°. The trochlea is 

 ne^irly in the vertical, a little oblique to the longitudinal axis of the 

 foot. The exterior malleolar facet is well marked, and bounds a lateral 

 fossa above. The neck of the astragalus is broad and not contracted, but 

 not wider than the trochlea. Its navicular facet is wide and concave, 

 the cuboid narrow, with a long angle behind. The cuboid is quite elon- 

 gate, and with a narrow anterior face ; it has a large posterior tuberosity 

 not projecting much posteriorly. The navicular is Hat, with a sigmoid 

 proximal face, convex on the inner side, concave on the outer. It 

 has the three cuneiform facets below the inner antero-posterior. The 

 inner is a flat bone with antero-posterior x>lane and apex directed back- 

 ward, and considerably oblique facet for the second metatarsal. The 

 mesocuneiform is much the smaller, and brings the third metatarsus a 

 short distance proximal to the fourth. The ectocuneiform is a little 

 wider than deep. The metatarsals are three, and are rather slender. 

 The two outer are equal in length, and the median.but little wider jirox- 

 imally, the increased width being more obvious distally. They have no 

 proximal grooves, and the outer has a low outer tuberosity. The facets 

 of the second row of tarsals are y y y. The phalanges, including un- 

 gueal, are 3, 3, 3. The proximal ones are longer than wide and con- 

 tracted at the ends ; the penultimate are still stouter in form. The 

 ungues of middle line are symmetrical and broad, with the margin a 

 segment of an ovoid, and slight contraction at the neck. The proximal 

 articulation is bounded by a fossa on each side, which is in its turn 

 isolated by the elongate process found in the tapir and in the horse. 

 The margin is marked by radiating strice separated by groo^'es, of which 

 the median is the most marked. The lateral ungues are contracted on 

 the inner side, and only possess the proximal fossa and hook on the 

 outer side. The median distal groove is well marked. 



Measurements. 



M. 



Length of bind foot from heel 0.286 



Length of calcaneum 083 



Length of cuboid facet of calcaneum 024 



