460 THE WASATCH FATJifA. 



The phalanges are absolutely longei* and narrower than those of Hy- 

 rachyus agrestis; those of the second and fourth digits are also flatter. The 

 iirst phalange of the hallux is subround proximally, and its form is some- 

 what irregular. The superior face is concave ; there is a low tuberosity on 

 the external side below the middle, and the side next the second is flat dis- 

 tally ; the distal facet is deeper than wide, and is not recurved above. The 

 proximal facets of the second and fourth phalanges are less transverse than 

 that of the median phalange ; i. e., they are narrower and more convex 

 above. Their distal facets are not emarginate, and are but little recurved. 

 The second phalanges are nearly square, or as wide as long. The proximal 

 superior edge is a little produced ; the distal facets are not emarginate, and 

 are very little recurved. The ungual phalanges are even more obtuse than 

 those of the anterior foot, especially those of the first, third, and fifth digits. 

 As in the case of the other phalanges, the median is the most depressed, and 

 they become less depressed to the first and fifth. The ungues of the sec- 

 ond and fourth digits are rather more acuminate than those of the first and 

 tifth ; while that of the fourth is broadly rounded. They all have a median 

 foramen just within the border. The neck is but little constricted, and the 

 proximal angles are not produced. The inferior sides of the ungual pha- 

 langes have a flat proximal area rather larger than a semicircle, between 

 which and the margin is a concave space of a very wide crescentic form. 



Measurements of posterior foot. 



M. 



Total length from heel 162 



Length of tarsus 106 



Length of median metatarsus 073 



Length of median digit 066 



I. — Tarsus. 



Xength of calcaneum 082 



Depth at heel 022 



Width at sustentaculum 035 



Depth at astragalar condyle 031 



Diameters cuboid facet ^ vertical 021 



< transverse 024 



Length of astragalus on inner crest 042 



Length of astragalus on outer crest 033 



Width of trochlea, including crests 025 



External elevation of trochlea 022 



Diameters navicular face ^ ^'"^'"^*^ °^^ 



transverse 024 



'\ 



