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 yello-w- 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, 

 " differs 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." 



unc. 



Total length 1 



Width 



between orbits 



Length of nasal bones 



From outer side of incisors (upper jaw) 

 to front molar tooth 



} 



Space occupied by the five molars on 1 



either side of upper jaw J 



Length of palate 



. of ramus of lower jaw from! 



front to posterior part of condyle . . / 



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 



