264 



PR0CIEEDING8 OF THE NATIONAL MUSEUM. 



VOL. XXXVI. 



Measurements of Spceimcn, Cat. No. .'t277, U.S.N.M. 



mm. 



Greatest transverse diameter of outer tarsal 52 



Greatest antero-posterior diameter of outer tarsal 72 



Greatest transverse diameter of iuuer tarsal 64 



Greatest antei'o-posterior diameter of inuer tarsal 92 



The metatarsals. — There were three functional digits in the hind 

 foot, the first being rudimentary and the fifth wanting. The meta- 

 tarsals are much longer and heavier than the metacarpals, the third 



being the longest. 

 The proximal ends of 

 the second, third, and 

 fourth metatarsals are 

 in the closest mutual 

 apposition, their 

 shafts being closely 

 applied for about one- 

 half of their length. 

 The third and fourth 

 support the two 

 cushion-like tarsalia. 



The metatarsal of 

 the first digit is a 

 short, splint-like, ir- 

 regularl}^ curved bone, 

 with a s m o o t h, 

 rounded proximal end 

 compressed laterally. 

 The thickened rugose 

 distal articular end 

 looks out obliquely 

 from the main axis of 

 the shaft, and sup- 

 ports two phalanges. 

 It appears quite as 

 Marsh has described 

 it as being rudi- 

 mentary and probably did not reach the ground. It articulates loosely 

 with Metatarsal II, lying in a broad, shallow, longitudinal depres- 

 sion on the inner proximal half of this metatarsal. 



The second metatarsal is slightly longer than the fourth, the third 

 being longest. The proximal end is compressed transversely, but is 

 much lengthened antero-posteriorly. The face which is applied to the 

 third is plane, while the outer surface is irregularly concave. The 

 articular end is gently convex antero-posteriorly, and has a roughly 

 pitted surface. Just below the middle of the shaft on the antero- 



FiG. 35. — Right hind foot, Camptosaukus dispar 

 Marsh. Cat. No. 4277, U.S.N.M. ; 4 n.\t. size. Seen 

 FROM the front : t, two tak.sal bo.xes of the distal 

 row ; I, II, III, IV, FIRST to fourth digits. Unguals 



OF digits /, ///, AND IV DRAWN FROM THE FEET OF 



other individuals. 



