(312 THE PUEECO FAUNA. 



Measurements of femur. 



M. 

 Luiigth from little to great trochanter, inclusive 060 



Diameters iiist below little trochanter < ^ 



c transverse 0"22 



The astragalus displays a very slight concavity of the trochlea in the 

 transverse direction, while the anteroposterior convexity is more pronounced. 

 Although the head is not distinguished by a neck, there is between the 

 tibial and the navicular facets, a transverse, oval fossa. The external face 

 of the trochlea is nearly vertical, the anterior inferior angle alone diverging a 

 little outwards, and still less downwards. Both anterior and posterior sides 

 of this face are vertical. The former is somewhat concave. The inner side 

 of the trochlea is oblique, and its posterior extremity is broadly rounded. 

 The internal distal facet, peculiar to this genus and to Bathmodon, is ver- 

 tical, and is more than half a circle. The posterior flexor tendinous groove 

 is roofed over, so as to be a foramen; its suj^erior opening is large and 

 transverse and looks posteriorly. 



The navicular is a short and flat bone. Its internal extremity is nar- 

 row in front, and obliquely truncate. The external side is squarely trun- 

 cate for contact with the cuboid. The posterior tuberosity is small and 

 rounded, and is at the postero-external angle. The ectocuneiform facet is 

 flat and trapezoidal in form, is wider transversely than that of the nieso- 

 cune'iform, and does not extend so far posteriorly. It is separated from 

 the latter by a small round fossa posteriorly. The mesocuneiform facet is 

 convex anteroposteriorly, while the entocuneiform is smaller and sub- 

 triangular. 



Measurements of tarsus. 



M. 



Length of astragalus at internal side 025 



Length of astragiilus at external side 016 



Total width at trochlea 027 



Total width of trochlea 015 



Total width of head 020 



Total width of uaviciilar facet 014 



Depth of navicular facet at middle 013 



Depth of cuboid facet at middle 008 



Depth of external face in frout 012 



Diameters of navicular 5 anteroposterior 0105 



( transverse 017 



Diameters of ectocuneiform facet of do. \ -interoposterior OOdS 



< transverse 008 



Vertical depth of cuboid facet of do 005 



