120 DINOCERATA. 



m. 



Antero-posterior diameter of face for fourth metacarpal .055 



Transverse diameters of face for fourth metacarpal, .01 3-.04 1 



Antero-posterior diameter of face for fifth metacarpal, .04 1 



Transverse diameter of face for fifth metacarpal, .023 



Measurements of Right Unciform. [Diuoceras iiurahile, No. 124(.) 



m. 



Length of longitudinal axes of unciform, .046-073 



Antero-posterior diameter, ._- . .084 



Transverse diameter, — ... .091 



Antero-posterior diameter of face for lunar, 070 



Transverse diameter of face for lunar, . - . .023 



Antero-posterior diameter of face for pyramidal, .073 



Transverse diameter of face for pyramidal, . . _ .0L3 



Antero-posterior diameter of face for third metacarpal (approximated, . . .057 



Transverse diameter of face for third metacarpal, .029 



Antero-posterior diameter of face for fourth metacarpal, . - .070 



Transverse diameters of face for fourth metacarpal, _..__ .019-.04S 



Antero-posterior diameter of face for fifth metacarpal, ._.. ..- .055 



Transverse diameter of face for fifth metacarpal, 025 



Measurements of Right Unciform. {Tiiwceras ingens, 'No. 1509.) 



m. 



Length of longitudinal axes of unciform (approximate), 051-085 



Antero-posterior diameter, .080 



Tranverse diameter, ,_ — .._ .. .098 



Antero-posterior diameter of face for pyramidal (approximate), — .070 



Transverse diameter of face for pyramidal, 077 



Antero-posterior diameter of face for third metacarpal, 057 



Transverse diameter of face for third metacarpal, .027 



Antero-posterior diameter of face for fourth metacarpal, - 067 



Transverse diameters of face for fourth metacarpal, .016-056 



Antero-posterior diameter of face for fifth metacarpal, -. .056 



Transverse diameter of face for fifth metacarpal, _. 030 



The Metacarpal Bones. 



(Plates XXXV, XXXVI, XXXVII, and Plate LIV, ^gure 1.) 



The metacarpal bones in the Binoceratn are sliort and robust. They 

 are five in number, and each represents a well developed dig-it. Their 

 general form and position in the foot of Dlnoceras mirahUe are shown in 

 Plate LIV, figure 1, and also in the restoration of this species, Plate LV. 



