THE illND FEET. 163 



Tliu dicitul end (Piute Lll, ligure 3) is large and rounded, and, in 

 seme specimens, distinctly oblique. It supports the usual face for the 

 first plialanx, and below, two shallow grooves for a pair of sesamoid 

 bones. The phalangeal face is, iu all the specimens preserved, distinctly, 

 though slightly, convex in both directions. 



The Fouktii Metatarsal. 

 (Plate LII, figures 4-!), and Plate LIV, figure 2.) 



The fourth metatarsal is of about the same size as the third, and 

 consideraljly resendjles it in structure This reseuiljlance is nuich greater 

 than in the elephant, where the fourth is decidedly shorter than the third 

 metatarsal. 



The shaft of the fourth metatarsal is* strongly constricted medially, as 

 seen in Plate Lll, figures 5 and 7, and bears on the luider side, at the 

 proximal end, a lai'ge projecting tubercle. 



The proximal end (figure 8) bears a nearly flat articular surface, 

 sub-triangular in outline, and nearly perpendicular to the long axis of the 

 bone, and articulating, during life, with the cuboid bone. This surface 

 is confluent on the outer side with a small lateral tacet shown in figure 7, 

 which corresponds with a similar face on the fifth metatarsal. On the 

 opposite, or inner side, is an oval fiicet (figure 5) articulating in life, with 

 a prominent face on the third metatarsal. 



The distal end of the fourth metatarsal (figure 9) is but little oblique 

 to the axis of the bone, and bears the usual faces, for articulation with the 

 phalanx, and the sesamoids. The j)lialangeal articulation. may be concave 

 from side to side (number 1191:)), but is usually slightly convex in both 

 directions. 



The Fifth Metatarsal. 

 (Plate LII, figures 10-15, and Plate LIV, figure 2.) 

 The fifth metatarsal in IHnoceras is shorter than any of the others 

 except the first," but is robust, and evidently afforded its full share of 

 support to the foot. ~ 



