G8 December 1855, and the second specimen in the same month of the following year. Both these individuals, as soon as I had completed my notes, I sent to Mr. Hancock, who received them in good con-dition, and who, in conjunction with Mr. Alder, I am happy to say, has made drawings of all the species described in this paper, — I trust, in order to enrich, at an early period, another number of their ad-mirable work on the Nudibranchiate Mollusca. Mr. Hancock sug-gests for this species the specific name of fimhriata ; but, whilst admitting the propriety of the name, I trust he will fall in with my wish of identifying the district in which it was first taken. I would here remark the irregular appearance of some of theNudi-branchs. Two species of Boris, formerly obtainable in "Weymouth Bay in moderate abundance, are now scarce ; Eolis papillosa, at one time very abundant, is now represented by an occasional specimen : these are all tidal species. Eolis coronata and landsburgi were never very plentiful, and are not less scarce than formerly ; but far different is it with Folycera A-lineata and Antiopa cristata. Some three years since, we could obtain a dozen of each of these species any day — I have seen three in one net (both these species appear to be gregarious) ; whilst during the whole of the past summer my cap-tures have not exceeded half a dozen of both species for the whole year. The dearth was occasioned by the severe winter we had some few years since, and which also destroyed many fish, and rendered Adamsia palliata very rare. 5. Description of Six hitherto Undescribed Species of Bats. By Robert F. Tomes. 1. Scotophilus microdon, n. s. The present species is one having the same subgeneric characters as the common Pijnstrelle of Europe and the Scot, greyii and S. •pumilus of Australia. To the latter species it is, by the form of its head and ears, most nearly afiine, but may at once be distinguished from it by its greater size and by its smaller teeth. The crown is but little elevated above the facial line ; but the muzzle, although short, is more pointed than is usual in the flat-crowned species. The ears are very small, nearly as broad as high, with the outer margin slightly hollowed out about the middle, below which is a faintly developed lobe, and immediately above which is the tip of the ear, — the latter being obtusely angular, and directed outwards. The inner margin is very much rounded, especially at two-thirds of the distance from the base, where the convexity is so prominent as to be quite as high as the tip itself, the portion be-tween this prominence and the tip being nearly horizontal. Alto-gether the ear bears some resemblance to that of Miniopteris. Scot. 2iumilus is the only species which has ears of form similar to those of the present species ; but they are, although the species is smaller, rather larger, relatively longer, and have their tips less
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