THE HIND FEET. 159 



The dorsal surface of the bone (Ir'late L, figure 7) is rugose and 

 tubei'cuhited, and the plantar extremity (figure !)) also presents a rather 

 promiuent protuberance. 



Of the lateral faces, the inn?r (figure 8), turned toward the 

 eiitocinieiforni, presents, along the proximal part of its margin, a more 

 or less elongated facet, for articulation with that lione. The opposite side 

 (figure 10) turned toward the ectocuneiform, is moderately rough, and 

 destitute of any articular face. 



'I'he proximal articular face (figure 11) is nearlv flat, slightly l)roader 

 above than below, and, along the inner margin, conHuent with the lateral 

 face for articulation with the entocuneiform. 



The distal face (figure 12) is also nearly flat, and, in life, supported 

 in part, but not entirely, the second metatarsal bone. The latter presented 

 nearly as large a face to the ectocuneiform, as to the mesocuneiform. 



The following measurements give the principal dimensions of this 

 bone in two specimens of Dinoccras iiiirabile : 



Measurenieitts 'of Left J/esocu/ieform. {I>i)ioceras m/'rabile. No. 1210.) 



Greatest diameter of mesocuneiform, 058 



TransA'erse diameter, .032 



Antei'o-posterior diameters (axial), ,._. . .014-020 



Measwemcnts of Left Meso<Miiie/form. (Diiioceras mirahile, No. 1208.) 



m. 

 Greatest diameter of mesoeuneiform, .053 



Transverse diameter, .026 



Antero-posterior diameters (axial), ., 014-018 



The Ectocuneiform. 

 (Plate L, -figures 1P.-1 8.) 

 The ectocuneiform is triangular in outline, tapering distinctly, and 

 in most specimens nearly to a point, toward the }jalmar surface of the foot. 

 It is much less oblique than the corres])ondiiig bone in the elephant, and 

 usuallv has the two distal faces more distinctly marked. It is also 

 proportionally less elongated from the dorsal toward the plantar side oi 

 the foot. "^ 



