PEOFBSSOE OWEN ON THE GENUS DINORNIS. 369 



femur of Uromaius ; the trochanter hardly rises above the level of the head ; the 

 back of the trochanter is scarcely at all accentuated, chiefly shows a smooth, feeble 

 concavity ; there are no gluteal rugosities, no trace of a lesser trochanterian place of 

 muscular attachment. The popliteal ca%ity is a shallow groove, not bounded by any 

 post-intercondylar ridge from the intercondylar space. The distal expansion is rela- 

 tively much less than in Dinornis; the inner condyle is much narrower. The tibial 

 part of the outer condyle has relatively more longitudinal extent in Bromaius than in 

 Dinornis; it rises well above the fibular division, which is relatively shorter than in 

 Dinornis, where it equals in that dimension the tibial prominence. But the fibular 

 division projects more outwardly m Dromaius, is broader in proportion to its length, 

 and more generally convex. There is no trace of the rough pit for ligamentous or 

 muscular attachment above the fibular division of the outer condyle which so markedly 

 distinguishes the femur of Dinornis. 



The antero-posterior extent of the outer condyle is much greater than that of the 

 inner condyle in Dromaius; the difi"erence is less in Dinornis giganteus'. Din. casua- 

 rinus\ and Din. didiformis\ The antero-posterior dimension of the outer and of the 

 inner condyle are nearly the same in Dinornis gravis. 



The pelvis of Dinornis gravis is characteristically massive and ponderous, and accords 

 in shape with those figured in plates 19 & 20 of the first Memoir'. 



The upper and outer bony wall of the hinder expansion, beyond the gluteal rido-es'. 

 is better preserved than in figure 3, jjlate 20 ^ 



Eight coalesced vertebrae with combined par- and pleur-apophyscs precede the three 

 interacetabular vertebrae, in which those processes are wanting. The bodies of these 

 are broader and flatter below than in the subject of figure 2, pi. 19. vol. iii. Trans. 

 Zool. Soc. After the above eleven sacrals follow six vertebree with par- and pleur- 

 apophyses again abutting against the iliac walls. 



The fii-st sacral has, on each side the centrum, a circular cup for the head of a free 

 rib, behind which cup is a large pneumatic foramen. The ribs of the seven succeedino. 

 sacrals are anchylosed and short, abutting against and coalescing with the closely 

 grasping plates of the antacetabular parts of the ilia. The interpleural vacuities of 

 the eight anterior sacrals rapidly decrease in size to the fifth, and again slightly expand 

 in the last two. The first three pairs of anchylosed ribs incline forward ; the next three 

 paii-s are transverse ; the last of this series curves slightly backward, commencino- that 

 curve which is carried out by the proximal ends of the ischia. Both ischia and pubes 

 in the present specimen are broken away from their origins at the acetabulum. The 

 following are the dimensions of this pelvis : — 



' Trans. Zool. Soc. vol. iv. pi. 44. fig. 2. ' lb. ib. pi. 46. fig. 3. ' lb. ib. pi. 24. fig. 3. 



* Zool. Trans, torn. cit. (1843). ' lb. vol. vii. p. 367. « Ib. vol. iii. 



VOL. VIII. — PAET VI. Ma^, 1873. 3 ^ 



