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Show 458 MR. F. E. BEDDARD ON HAPALEMUR GRISEUS. [Julie 16, special resemblances to that of Llapalemur. Nor can I find a close resemblance between the brain of Hapalemur and that of any of the Loris group (i. e. Loris, Nycticebus, and Perodicticus1). The brain-structure of Hapalemur undoubtedly justifies its position in the subfamily Lemurinse. Myology. As regards their myology, the Lemurs are one of the best-known groups ; there are, indeed, comparatively few types which have not been dissected ; as Hapalemur is one of these types, the present notes may be of use, if only as a further proof of the great uniformity in the muscular structure of these animals. The principal memoirs, which have served me as a basis of comparison between Hapalemur and other forms, are those of Murie and Mivart and of Milne-Edwards. Messrs. Murie and Mivart sum up, in their elaborate treatise on the myology of the Lemurs2, all the observations made previously to that publication-a proceeding which has not only enabled them to take a general survey of the importance of the muscular anatomy for classificatory purposes, but is also very saving of trouble to those who come after. Prof. Milne-Edwards3 deals with the muscular structure of the Indrisinse. As it is clearly to the types described by these writers that Hapalemur is related, I have not specially compared its muscles with those of the aberrant Chiromys, first described by Sir Richard Owen4, and more recently by Dr. J. F. Oudemans5, or with Tarsius. In the following account of the muscles of Hapalemur griseus I only describe those of the limbs, and for the most part only mention those which show any variation in the different genera, and those which show modifications characteristic of the whole group Lemu-roidea, such as, for example, the origin of the Rectus femoris by a double tendon. Fore Limb. 1. Trapezius.-The origin of this muscle commences at about the middle of the neck, and extends backwards so as to just overlap the latissimus dorsi; it is inserted on to the spine of the scapula, on to the posterior third of the hind margin, and on to nearly the whole of the front margin, being continuous in front with the levator claviculse; the two muscles are here so completely continuous that it is impossible to say that one overlaps the other. 2. Iihomboideus.-This muscle is single. 1 The brain of Arctoccbus calabarensis has not, so far as I am aware, been described. 2 "The Anatomy of the Lemuroidea," Tr. Z. S. vol. vii. p. 1. 3 «Histoire Naturolle etc. de Madagascar,' Mammiferes. 4 "On the Aye-Aye (Chiromys, Cuvier; Chiromys madagascariensis, Desm.; Sciurus madagascariensis, Gmel., Sonnerat; Lemur psilodactylus, Schreber, Shaw)," Tr. Z. S. vol. v. p. 33. 5 "Beitrage zur Kenntniss cler Chiromys madagascariensis," Verh.Ak. Anist. xxvii. |