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Show 1904.] ON FOSSIL BIRDS FROM MADAGASCAR AND EGYPT. 163 as in Man, but not so lasting a union between the anterior cex-ebx-als as ixx the Potto. Finally it may be noted that while in tlxe two species of Lemur the union of the two anterior cerebellar arteries takes place just in front of the optic chiasma and also at right angles to the subsequent course, thus resembling the anterior communicating artery of Man, the junction of the same two arteries in the Potto is invisible until the hemispheres are separated, and is thus oblique, as it is in such Monkeys, Rodents, and Oarnivoxu that I have been able to examine. 5. O n the Pelvis and Hind-limb of Mullerornis betsilei M.-Edw. & Grand. ; with a Note on the Occurrence of a Katite Bird in the Upper Eocene Beds of the Fayum, Egypt. By C. W . ANDREWS, D.SC, F.Z.S. (British Museum, Natural History). [Received January 14, 1904.] (Plate V * and Text-figure 15.) Among the numerous bird-remains brought back from Central Madagascar by Dr. Forsyth Major are some beautifully preserved bones of tlxe pelvis axxd left hind-limb of a small ratite bird referable to the genus Mullerornis of Milne-Edwards and Grandidierf. The femur, tibio-tarsus, fibula, and tarso-metatax-sus, as well as a considerable portion of the pelvis, were found in natural association, but xxone of the phalanges were preserved. No detailed description of any member of the genus having ever been published, a brief account of these specimens may be welcome. It may be said at once that these bones differ in no vexy striking manner from those of jEpyornis, axxd that they do not appear to throw any further light on the affinities of the iEpyornithhhe as a whole. Of the three species of Mullerornis distinguished by Milne- Edwards and Grandidier, tlxe bird in question agx-ees very nearly (in its dimensions) with M. betsilei, and since, moreover, it is from the same locality, it may be regarded as belonging to that species. The Pelvis (Plate V. fig. 1).-The pelvis, which seems to have been very long and narrow, is vexy badly preserved ; of the ilia the only portion in a tolerably perfect condition includes the acetabular region and a short distance behind it, while the pubes and ischia are represented by mere stumps only. In the preacetabular region of the pelvis the upper edges of the ilia must have united to form a strong iliac crest; just over the antitrochanter they diverge, forming the supra-trochanteric crests which constitute the anterior- boundaries of the pelvic escutcheon, of which in tlxe * For explanation of the Plate, see p. 171. f Comptes Rendus, t. cxviii. 1894, p. 125. 11* |