98 DINOCERATA. 



The innei' texture of the shaft of the xihia is similar to that of the 

 radius, as indieatod in tlie sections represented below, ligures 110 and 111. 



Figure 110. — Section of ulua of Dinoceras Ittcare, Marsh (No. lO.^S'). 

 FlGUHE 111. — Section of ulna of Dinoceras mirahik, Marsli (Xo. ID4S). 



Bolh figures are one-fourtli natural size. 



The principal dimensions of the ulna in three individuals of Dinoceras 

 are as follows : 



Measurements of Left Ulna. (Dinoceras mirabi/e. No. 1206.) 



m. 



Totalleugthof ulna, 530 



Diameter,? of proximal end, .095-140 



Transverse diameter of shaft, Iteliind humeral articular face, .055 



Diameter of .shaft, through humeral articular face, 097 



Diameters of shaft, near the middle, (i57-.081 



Antero-jjosterior diameter of shaft, ne.ar distal end, -. .-. .085 



Transverse diameter of shaft, near distal end, — .0(37 



Transverse diameter of humeral .articulation, greatest, _ .148 



Transverse di.ameter of humeral articulation, least, — .060 



Antero-posterior diameter of humeral articul.ation. at the middle, .085 



Antero-posterjor diameter of humeral articulation, inner lobe, _ . - _ .06.3 



Antero-posterior di.ameter of humeral articulation, outer lobe, . .045 



Transverse diameter of distal articular surface, .076 



Antero-posterior diameter of distal articular surface, . . . . _ _ . _ .070 



Least and greatest diameters of di-ital articul.ar surface, , . .i)67-.097 



Measurements of Right Ulna. [Dinoceras mirahile, No. 1'28'2.) 



ra. 



Total length of ulna, 555 



Diameters of proximal end, - . .098-130 



Transverse diameter of shaft, behind humeral articulation, .065 



Diameter of shaft, through humeral articulation, . 1 03 



Diameters of shaft, near the middle, . - .067-.O77 



Antero-posterior diameter of shaft, ne.ar dis'. al end, .095 



Transverse diameter of shaft, near distal ei:d, .084 



Least transverse diameter of humeral articulation, ..._..-- .058 



Antero-posterior diameter of humeral articulation, at the middle, 086 



