458 MR. F. E. BEDDARD ON HAPALEMUR GRISEUS. [June 16, 



special resemblances to that of Hapalemur. 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 Perodicticus^). The 

 brain-structure of Hapalemur undoubtedly justifies its position in 

 the subfamily Lemurinae. 



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, i\\ their elaborate treatise on 

 ihe myology of the Lemurs ^ 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-Edwards^ deals with the muscular 

 structure of the Iiidrisinsp. 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 Owen*, and more recently by Dr. J. F. 

 Oudemans^, or with Tarsius. 



In the following account of the muscles of Hapalemur grriseus T 

 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- 

 roidta, such as, for example, the origin of the Rectus /emor is 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. Rhomboideus. — This muscle is single. 



^ The brain of Arctocebus calabarensis has not, so far as I am aware, been 

 described. 



^ " The Anatomy of the Lemuroidea," Tr. Z. S. vol. vii. p. 1. 



3 ' Histoire Naturelle etc. de Madagascar,' Mamniit'eres. 



* "On the Aye- Aye {Chiromys, Cuvier; Chiromys madagascariensis, Desm. ; 

 Sciurus onadagascariensis, Gmel., Sonnerat ; Lemur psitodactyhcs, Schreber, 

 Shaw)," Tr. Z. S. vol. v. p. 33. 



^ " Beitriige zur Kenntiiiss der Chiromys madagascariensis," Verb. At. Ainst. 

 xxvii. 



