160 DINUCEKATA. 



The dorsal, or dermal, face (Plate L, figure 13) is roughened for 

 ligamentary attachment, and on the opposite, or plantar, side, the bone 

 is produced into a more or less prominent tubercle (figure 15). In the 

 natural position, during life, this elevation was just back of the proximal 

 end of the third metatarsal. 



The lateral surfaces of the ectocuneiform (figures 14 and 16) are 

 moderately roughened, and do not present articular surfaces for either 

 the mesocuneiform on the inner side, or for the cuboid on the outer side. 



The proximal articular face (figure 17) is nearly flat, or slightly 

 convex transversely, while, in a dorso-plantar direction, it may be more 

 or less concave. 



The distal surface (figure 18) presents two confluent, but usually 

 well marked, articular surfaces. Of these, the inner is narrow and oblique, 

 and supported, in life, the outer part of the second metatarsal. The 

 principal articular face of the distal end is nearly flat, sub-triangular in 

 outline, and narrowed toward the plantar end. In life, it supported the 

 third metatarsal bone. 



The tubercle upon the plantar side of this bone differs considerably 

 in size and form (numbers 1202 and 1229). The degree of distinction 

 between the two distal faces also varies in different specimens (numbers 

 1208, 1232, and 1199). 



The more important measurements of the ectocuneiform in fom- 

 specimens of Dinoceras are given below. 



Measurements of Right Ectocuneiform. [Dinoceras mirabile, No. 1199). 



m. 



Greatest diameter of ectocuneiform, .066 



Transverse diameter, 045 



Antero-posterior diameters, . J .014—026 



Diameters of proximal articular face, .0.30-.048 



Measurements of Left Ectocuneiform. [Dinoceras laticeps. No. 1202.) 



m. 



Greatest diameter of ectocuneiform, ._ . - .060 



Transverse diameter, __ — .040 



Antero-posterior diameters, . - .01 7-.024 



Diameters of proximal articular face, .033-.050 



