Mr. J. Black wall on newly discovered species of Araneidea. 233 peristome at the opposite side from that on which it is observable in M. altuMy Sow. Dr. Pfeiffer's supposed specimen of M, sec-tilabre is from Borneo, and is, unquestionably, M. Anostomaj showing a trace of the channel on the inside of the columellar lip, and none on the opposite side. Pfeiffer's Leptopoma Burmanum, collected by Dr. Theodore Philippi at Mergui, is not to be recognized in the collection. A bleached and worn shell, without an operculum, and inter-mediate in size between that shell and Cyclophorus expansus, is marked from Phie Than, and is probably only a variety of the species last named, with a more acute keel and a less expanded peristome. L. Burmanum was described from an immature spe-cimen, and will probably present a different aspect from the figure given in Chemnitz when found in its full development. Cheltenham, 25th January, 1856. Since the conclusion of the above paper, I have received, among some shells collected in the Burmese territory by Mr. Oldham, a third species of Hydrocena^ intermediate between H, sarrita and H. Illex, but larger than either. It was found at the Mya-leit Hill, near Ava, during the stay of the late embassy at that capital. XVIII. — Descriptions of three newly discovered species of Araneidea. By John Blackwall, F.L.S. Tribe Octonociiliiia. Family Linyphiid^e. Genus Neriene, Blackw. Neriene comigera. Length of the male y^g^th of an inch ; length of the cephalo-thorax ^^ ; breadth gV j breadth of the abdomen ^-^ ; length of an anterior leg '^ ; length of a leg of the third pair -^-q. The cephalo-thorax is oval, convex, glossy, slightly elevated before, where the eyes are situated, and has an indentation in the medial line : the falces are conical, divergent at the extre-mity, armed with teeth on the inner surface, and somewhat inclined towards the sternum, which is broad, convex, glossy, and heart-shaped : the maxillse are inclined towards the lip, which is semicircular and prominent at the apex : the legs are slender and slightly hairy; the first and fourth pairs are the longest and equal in length, and the third pair is the shortest ;
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