DE. J. VON HAAST ON A NEW SPECIES OE DINOKNIS. 179 



portion, and on its inner side, the medull-arterial orifice is situated. At the lower end 

 of the fibular ridge on the surface of the shaft a narrow and shallow channel begins for 

 the accommodation of the thin end of the fibula, which is rather conspicuous at its 

 termination 1-60 inch above the distal end of the tibia. In the larger Dinornithidge 

 this lower fibular channel is represented by a slightly raised linear tract. 



The posterior side of the shaft, as in all the other Dinornithidse, is flat in the upper 

 portion, gradually becoming convex in its lower half, the shaft itself being here much 

 flattened antero-posteriorly. In the upper and middle portions the shaft has the usual 

 three-sided form, caused by the presence of the procnemial ridge on the anterior side. 

 The rough low ridge and surface noticed by Sir Richard Owen, especially in Cnemiornis, 

 on the inner and anterior part of the tibia not far from its proximal end, is also well 

 developed, terminating 2-10 inches below that end. The extensor canal and its bridge 

 with the tuberosity at its outer pier exhibit the usual dinornithic features. There is 

 here also a flat, rough surface on the inner side reaching to the distal end of the shaft ; 

 this distal end repeats all the dinornithic characters, the tract forming the boundary 

 along the lower outlet of the extensor canal being, however, in comparison broader and 

 more developed than in the larger species. Every feature in this tibia proves also that 

 it belonged to a full-grown, mature individual, the proximal and distal epiphyses being 

 so thoroughly anchylosed that there is not the least sign of that junction visible. 



Fibula. 

 This well-preserved bone, 6-55 inches long, also possesses a slender form. The 

 proximal end, bent backwards, is 1T0 inch long and 0-28 inch broad. Its articular 

 surface on the tibial side is a little concave, on the opposite side the head is flat. 

 Below the head of the bone the shaft exhibits the usual trihedral form. The surface for 

 the articulation with the tibia, 2-40 inches long and in the middle 0-20 inch broad, 

 is rough and flattened ; below it the fibula contracts considerably, taking a needle- 

 shaped form with a sharp point. On the side opposite to the tibial articulation are 

 two rough surfaces for muscular attachment, of which the upper one is the longer. 

 Thus this bone also shows all the principal characteristic features belonging to even the 

 largest Dinornithidse. 



Taeso-metataesus. 

 Measurements. inches 



Length 4-43 



Middle of shaft 0-81 



Proximal end of shaft 1-58 



Distal end of shaft 1-98 



The tarso-metatarsus of the- species under consideration is a very characteristic bone. 

 Notwithstanding its smallness, it possesses the true dinornithic type, but some of the 



