42 



TRANSACTIONS OF WAGNER 



UINTA SELENODONTS 



Metatarsal v. is rudimentary, but as in the only specimen which retains a 

 part of it it is broken a short distance below the head, I am unable to say 

 whether it was elongate and filiform, like mt. ii., though there seems to be 

 no good reason to suppose that it was not. The proximal end is a little 

 broader and more club-shaped than that of mt. ii., but is less thickened in 

 the dorso-plantar diameter, and bears a small, slightly convex facet for the 

 cuboid. What remains of the shaft is excessively slender and thread-like. 



MEASUREMENTS. 

 Tibia, length .... 



thickness across cnemial crest 

 " breadth of distal end 

 " thickness of distal end 

 Calcaneum, length 

 Astragalus, length 



" width of proximal end 



" " distal end 

 Cuboid, height . 

 " breadth 

 " thickness 

 Navicular, height 



" breadth 



Ecto-cuneiform, height 

 Metatarsal hi., length . 



" " breadth of proximal end 



" " " " distal end 



Metatarsal iv., length 



" " breadth of proximal enc 



" " " " distal end 



Proximal phalanx, fourth digit, length 

 Second " " " " 



Ungual " " " " 



The phalanges much resemble those of Pocbrotlier 



o. 117 

 .024 

 .013 

 .0095 



•°33 



.017 



.00S 



.009 



.012 



.005 



.012 



.007 



.005 



.0055 



.061 



.006 



.007 



.062 



.005 



.007 



.020 



.01 1 



.0115 



mm, though they are 

 more slender in proportion to their length. The proximal phalanx is elon- 

 gate, narrow, and thin, and is slightly curved, making the approximate side 

 concave; the surface for the metatarsal is narrow, concave, and notched on 

 the plantar border for the carina. Towards the distal end the bone contracts 

 in breadth and especially in thickness; the distal trochlea is less notched 

 in the median line than in Pocbrolheriian, and its articular surface is reflected 



