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 ; .0.117 



" thickness across cnemial crest ..... .024 



breadth of distal end . . . . . . .013 



'■ thickness of distal end .0095 



Calcaneum, length ........ .033 



Astragalus, length . . .017 



width of proximal end . . . . . .ooS 



" " " distal end . . . . . . .009 



Cuboid, height . .012 



breadth . .005 



" thickness . ... . . . . . -012 



Navicular, height 007 



breadth 005 



Ecto-cuneiform, height . . . . . . . -005 5 



Metatarsal iii., length . 061 



" " breadth of proximal end .... .006 



" " " " distal end ..... .007 



Metatarsal iv., length 062 



" " breadth of proximal end .... .005 



" " " distal end ..... .007 



Proximal phalanx, fourth digit, length ..... -020 



Second " " " "... . . .011 



Ungual " .<.... 0115 



The phalanges much resemble those of Pocbrotlurinm, 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 Poebrotlieriuvt, and its articular surface is reflected 



