PROFESSOR OWEN ON THE GENUS DINORNIS. 369 
femur of Dromaius; 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 cavity 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 Dromaius 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 in 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 difference 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 ridges’, 
is better preserved than in figure 3, plate 20°. 
Eight coalesced vertebrae with combined par- and pleur-apophyses precede the three 
interacetabular vertebre, in which those processes are wanting. The bodies of these 
are broader and flatter below than in the subject of figure 2, pl. 19. vol. iii. Trans. 
Zool. Soc. After the above eleven sacrals follow six vertebre with par- and pleur- 
apophyses again abutting against the iliac walls. 
The first 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 succeeding 
sacrals are anchylosed and short, abutting against and coalescing with the closely 
grasping plates of the antacetabular parts of the ilia. The interpleural yacuities 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 
pairs are transverse; the last of this series curves slightly backward, commencing 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. pl. 44. fig. 2. 3 Tb, ib. pl. 46. fig. 3. * Th. ib. pl. 24. fig. 3, 
* Zool. Trans. tom. cit. (1843). * Tb. vol. vii. p. 367. © Tb. vol. iii. 
VOL. VIII.—PART VI. May, 1873. 3G 
