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Show 1868.J PROF. HUXLEY ON THE ALECTOROMORPHAE. 297 varies a good deal both in the Megapodidee and in the Cracidee. If we term the moiety of the dorsal aspect of the pelvis which is bounded in front by a transverse line drawn through the acetabula the postacetabular area, each group will be found to present some forms in which the postacetabular area is broad, and some in which it is relatively narrow. • Fig. 1. Fig. 2. m.xWp wi.x Fig. 1. The sternum of Crax globicera.-r. Rostrum, c.p. Costal process. pl. o. Pleurosteon. e. x. External xiphoid process; and i. x, internal xiphoid process of the metosteon. I. o. Lophosteon bearing the carina and ending behind in m. x, the middle xiphoid process. * * The inner notches. Fig. 2. The sternum of Lophophorus impeyanus. The letters as before, except pt. o, metosteon. Thus Talegalla has the postacetabular area broad, while Megapodius has it narrow. The Penelopince (Penelope, Oreophasis, Ortalida) have the postacetabular area broad; but in the Cracince (Crax, Pauxi) it is narrow (figs. 3 & 4, p. 298). M . Blanchard has already indicated some of the differences between the Cracidee and the ordinary Gallinaceous birds. " Les types essentiellement Americains, comme les iUectors, c'est a dire les genres Urax, Crax, et Penelope, s'cloignent a quelques |