1883.] 551 [Cope. 



the outer is concave, the head being narrower before than behind. It has 

 a lateral facet on each side ; the inner plane, the external concave in the 

 vertical as well as in the anteroposterior direction. It thus approaches the 

 form of a metatarsal, but is not so strongly excavated, nor is the head 

 notched on either side. The unciform face is convex anteroposteriorly 

 and plane transversely. 



The femur is broken up so that I cannot restore it. The head of the tibia is 

 gone, but a considerable part of the astragalar face is preserved. This is 

 transverse to the long axis of the tibia. It is narrowed anteroposteriorly 

 next the fibular facet. Malleolus lost. The shaft is robust, and does not 

 expand distally for articulation with the astragalus. Three centimeters 

 proximal to the distal end, the external side throws out a low, rough, ridge-like 

 tuberosity. Above the middle the crest turns outwards, leaving the internal 

 face convex. There is a broken patella, which has one facet much wider 

 than the other. 



The astragalus has the trochlear portion a little oblique. That is, the in- 

 ternal crest is a little lower than the external, and the inner face is a little 

 sloping- The latter is impressed by a fossa above the posterior part of the 

 sustentacular facet, which runs out on the neck. The trochlea has a shallow 

 groove which is nearer the external than the internal crest, and which 

 passes entirely round the posterior aspect to the plane of the inferior face 

 of the astragalus. The groove for the flexor tendon is thus entirely en- 

 closed, and issues on the inferior face at the posterior extremity of the 

 groove which separates the sustentacular from the condylar facets. The 

 external crest of the trochlea is less prominent posteriorly than the internal, 

 thus reversing the relations of the superior part. The internal ridge be- 

 comes quite robust, but does not flatten out and project sub -horizontally 

 as in Oxyoma forcipata. The fibular face is vertical ; neither its anterior nor 

 posterior angles are produced. The neck is somewhat contracted (the in- 

 ternal side is injured). The head is a transverse oval, strongly convex 

 vertically, moderately so horizontally, and without flattening. A meso- 

 cune'iform (or possibly ectocuneiform) bone is wedge-shaped in horizontal 

 section, without posterior tuberosity, and its anterior face is a slightly ob- 

 lique square. The narrower facet is oblique in the transverse sense. 



The metatarsals are represented, excepting the first and second. The 

 only complete one is the fifth. The heads of the third and fourth are much 

 like those of Oxymna, forcipata, and of about the same size. Their anterior 

 width is equal, and in both the external side is more oblique than the in- 

 ternal. Both have a notch at the middle of the internal side, but they dif- 

 fer in that the third has an open notch on the external side which is want- 

 ing to the fourth. The lateral excavations of the external sides are deep 

 and rather large, and thin out the anterior external edge. The lateral 

 facets are correspondingly large on the fourth and fifth ; on the third meta- 

 tarsal it is small, and a mere decurvature of the proximal surface. That of 

 the fourth is longer proximo-distally than transversely. That of the fifth 

 is about as long as wide, and presents more anteriorly ; or, to express it 



