64 Microscopical Society, body, and outer side of the hinder legs, is deep brown (a much richer and deeper colour than the same parts in Sc. bivittatus) : this tint is produced by the admixture of rust colour and black, the hairs being of the latter colour, and rather broadly annulated with rusty-red near the apex. The tail is not very bushy ; the hairs are black, with two bright rusty bars. The under parts of the body are grayish white, with a faint yellow tint : the head and fore legs are grayish, and the feet are black, slightly grizzled with rust colour." Mr. Waterhouse then proceeded to point out certain differences observable in the skulls of two species of Squirrels, which are usually confounded under the name Sciurus Palmarum, and the external characters of which he had pointed out in the " Magazine of Natural History" for September 1837, p. 496. The specific name tristriatus is there proposed for the new species. "The skull of Sciurus tristriatus," observes Mr. Waterhouse, " diiFers from that of Sc. Palmarum in being a little larger, consider-ably broader in proportion, and in having the upper surface less convex ; the post-orbital process is larger, the width between the orbits is greater, and the nasal portion is more suddenly contracted ; the nasal bones are larger, and narrower posteriorly. Following are the dimensions of the crania of these two species of Squirrel." Sc.Palmarum^ unc. lin. Total length 1 6 Width 104-between orbits 54 Length of nasal bones 5-^ From outer side of incisors (upper jaw) 1 to front molar tooth J Space occupied by the five molars on 1 „ , either side of upper jaw J "^ Length of palate 7-1-of ramus of lower jaw from! front to' posterior part of condyle . . j 10 Sc. tristriatus, unc. lin. lU 64-6 54 4+ 9 Oi MICROSCOPICAL SOCIETY. The Microscopical Society of London, held their first Meeting on Wednesday, January 29th, at the Horticultural Society's Rooms, No, 21, Regent Street. The meeting was attended by upwards of a hundred members and visitors. The President Professor Owen, announced that since the provi-sional meeting on the 20th of December, for the purpose of forming the Society, the number of members had increased to one hundred and ten, and a further addition of twenty-nine names was announced in the course of the evening, making a total of one hundred and
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