142 MK. F. E. BEDDAKD OX THE [Feb. 19, 



termed by Dr. Mirart tbe " Ursine Lozenge." Dr. Mivart has 

 justly laid stress upon the prevalence of this definite area in the 

 Arctoid brain. He defines the Arctoid brain by the presence of 

 the " Ursine Lozenge." The " Ursine Lozenge '" of Gulo is most 

 like that of GaJktis among the types which I have examined, thus 

 confirming the justice of its placing by Dr. ^livart ' and others. 

 The brains of these two animals are intermediate in character 

 between those of Xasua, Icioniix, and Mustela on the one hand, 

 and those of Helictis, ileles, and MeUivora on the other. In the 

 former group the lozenge is absent owing to the absence of a 

 precrucial sulcus. I found traces of it in Xasiia, which genus, it 

 will be remembered, approaches Galidis in the presence of a pos<>- 

 crucial bridging convolution between the hippocampal and sagittal 



gyri- 



Both Prof. Garrod " and Dr. Mivart were, in my opinion, wrong 

 in regarding the brain of Helictis, first described by the former, as 

 " exceptional." In Mehs taxus we meet with precisely the same 

 appearance of the hippocampal gyrus upon the upper surface of 

 the brain. Li these animals and, according to Mivart, in MeUivora 

 there is an ursine lozenge formed which is completely closed in 

 front. These therefore form the extreme term in a series which 

 commences with the simpler brain of Idonyx. 



2. On the Brain in the Lemurs. By 

 Frank E. Beddard^ M.A., F.R.S.^ Prosector to the Society. 



[Eeceived February 11, 1895.] 



During the last few rears I have accumulated a number of well- 

 preserved Lemurs' brains extracted from specimens that have died 

 in the Society's Gardens. I have thought that it might be useful 

 to publish an illustrated account of some of these in order to 

 supplement the existing knowledge of the Lemurine brain. The 



brains that I have examined mvself are the following : — 



o 



Lemur mongoz, Galago erassicaudatus, 



Lemur hrunneus, Galago monteiri. 



Lemur anjuanensis, Cheirogaleus coquerdi. 



Lemur coronatug, Loris gracilis. 



Lemur albifrons, Siictictbus tardigradus, 



Lemur rujipes, Perodicticus potto, 



besides Hapalemwc griseus, of whose brain I have recently published 

 a description^. 



The literature referring to the Lemiuine brain is not great. 



' " On the Anatomv, Classification, and Distribution of the Arctoidea," 

 P. Z. S. 1885, p. &40. 



- " Notes on the Anatomy of Helictis subaurantiaca," P. Z. S. 1879, p. 305. 

 ' "Additional 2«ote8 upon HapaUmur griseus," P.Z. S. 1891, p. 456. 



