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Show 1873. MR. ST. G. MIVART ON THE LEMURS. 491 It may be well to add here that:- 1. The sixth cervical spine is moderately developed. 2. There is no hypapophysial ridge beneath the cervical vertebrae (fig. 9). Fig. 9. Ventral aspect of cervical vertebra: of Hapalemur simus. 3. The spinous processes of the lumbar vertebrae are elongated, pointed, and very much inclined forwards. 4. The transverse diameter of the thorax is rather less than its depth. 5. The dorsal region of the spinal column is of moderate extent. 6. The cartilages of the ribs are not expanded before joining the sternum. 7. There are no hyperapophyses. 8. The naviculare is relatively short (fig. 14, n, p. 501). The dimensions and proportions are given in the Table annexed to this paper. The last genus to be noticed in this paper is Cheirogaleus. I have more than once expressed a doubt as to the validity of the distinctions between Cheirogaleus and Microcebus, which I reduced in 1867* to "a few cranial and dental characters." I am now fully convinced that the so-called Microcebi and Chei-rogalei constitute but a single natural genus, which must of course bear the older designation, namely Cheirogaleus. Since m y last paper on the Lemuridae was published, various skins and osteological specimens have been added to the national collection ; and I had contemplated revising the species as far as the materials at hand would permit. Professor Milne-Edwards, however, has very kindly informed me that he is occupied with M . Alfred Grandidier in preparing for pub- * P. Z. S. 1867, pp. 900 & 972. |