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Show 142 MB. F. E. BEDDAED ON THE [Feb. 19, termed by Dr. Mivart the " Ursine Lozenge." Dr. Mivart has justly laid stress upou 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 Galictis among the types which I have examined, thus confirming the justice of its placing by Dr. Mivart' and others. The brains of these two animals are intermediate in character between those of Nasua, Ictonyx, and Mustela on the one hand, and those of Helictis, Meles, and Mellivora 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 Nasua, which genus, it will be remembered, approaches Galictis in the presence of a post-crucial bridging convolution between the hippocampal and sagittal gyri. Both Prof. Garrod 2 and Dr. Mivart were, in m y opinion, wrong in regarding the brain of Helictis, first described by the former, as " exceptional." In Meles taxus we meet with precisely the same appearance of the hippocampal gyrus upon the upper surface of the brain. In these animals and, according to Mivart, in Mellivora 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 Ictonyx. 2. O n the Brain in the Lemurs. By F E A N K E. B E D D A E D , M.A., F.R.S., Prosector to the Society. [Eeceived February 11, 1895.] During the last few years 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 tbe Lemurine brain. Tbe brains that I have examined myself are the following:- Lemur mongoz, Galago crassicaudatus, Lemur brunneus, Galago monteiri, Lemur anjuanensis, Cheirogaleus coquereli, Lemur coronatus, Loris gracilis, Lemur albifrons, Nycticebus tardigradus, Lemur ruflpes, Perodicticus potto, besides Hapalemur griseus, of whose brain I have recently published a description3. The literature referring to the Lemurine brain is not great. 1 " On the Anatomy, Classification, and Distribution of the Arctoidea." P. Z. S. 1885, p. 340. 2 " Notes on the Anatomy of Helictis siibaurantiaca," P. Z. S. 1879, p. 305. 3 "Additional Notes upon Hapalemur griseus," P. Z. S. 1891, p. 456. |
