THE FORE FEET. ng 



FiGnRE 123. — Right unciform of Dinnreras viirahile, Marah (No. 1211); side view. 

 FiGUKE 124. — Rig-ht UDcifnira of Tinacerus ingens, Mareh (N'o. 1509); side view. 

 7?i['V. face for fifth metacarpal; p. face for pyramidal. 



Both figures are one-half natural size. 



Four specimens of the unciform bone from different individuals of 

 Dinocerata have the following dimensions : 



3fecisureme>its of Left T^ncifomi. (Dinoceras nih'ahile, Xo. 1208.) 



m. 



Length of longitudinal axes of unciform, . .041-.068 



Antero-posterior diameter, .._. 068 



Transverse diameter, .086 



Antero-posterior diameter of lunar articular face, .062 



Transverse diameters of lunar articular face, .020-024 



Antero-posterior diameter of face for pyramidal, .- -. 060 



Transverse diameter of face for pyramidal, _.. , .055 



Antero-posterior diameter of face for third metacarpal, Ood 



Transverse diameter of face for third metacarpal, 025 



Antero-posterior diameter of face for fourth met.acarpal, . .056 



Transverse diameters of face for fourth metacarpal, .. . _- .021-.043 



Antero-posterior diameter of face for fifth metacarpal, 048 



Transverse diameters of face for fifth metacarpal, .020-025 



Measurements of Right Unciform. (^Di)ioceras mirahi/e, 'No. 1195.) 



m. 



Length of longitudinal axes of unciform, -.038-.06'> 



Antero-posterior diameter, .067 



Transverse diameter, .079 



Antero-posterior diameter of face for lunar, .059 



Transverse diameter of face for lunar, .019 



Antero-posterior diameter of face for pyramidal, — .06 1 



Transverse diameter of f.ace for pyramidal, - 068 



Antero-posterior diameter of face for third metacarpal (approximate), _ .052 



Transverse diameter of face f or~third metacarpal, .026 



