There is another bat in Senegal, which has also a membrane upon its nose, not in the form of a horse-shoe, or javelin, as in the two bats we have just mentioned, but in the shape of an oval leaf. These three bats, being of different climates, are not simple varieties but distinct and separate species. M. Daubenton has given the description of the Senegal bat, under the name of the _leaf bat_, in the Memoirs of the Royal Academy of Sciences, 1759, p. 374. Bats which have great affinities to birds, by the power of flying, and the strength of their pectoral muscles, seem to resemble them still more in these membranes, or crests, which they have on their faces. These redundant parts, which, at first sight, seem only to be superfluous deformities, are real characters which fill up the visible shades between these flying quadrupeds and birds; for most of the latter have crests, or membranes, about their beaks and heads, which seem in every respect as superfluous as those of the bats. SUPPLEMENT. We have received from M. Pallas the figures and descriptions of two bats hitherto unknown to naturalists; the first he calls the _cephalote_, or large-headed bat, (_fig. 178._) from its head being so very large in proportion to its body. This bat M. Pallas says is found in the Malacca islands; and from his finding but one foetus in a female, which was sent to him to Amsterdam, and which he dissected, he concludes they have but one young at a time: this species differs also from all others in the teeth, which in some measure resemble those of the mouse or hedge-hog; it has a short tail, situated between the thighs, a large nose and a broad muzzle; its breast is very similar to that of a bird; it is very near four inches long, and its wings extend above a foot. The second he calls the _vespertilio soricinus_, or _shrew bat_ (_fig. 179._); this one has no tail, and carries a peculiar membrane on its nose; it is the smallest that is met with without a tail, being not more than two inches in length. This species is very common in the warm climates of America, the Carribbee Islands, and Surinam. At the same time M. Pallas sent us the account of these animals he remarked that we were in an error in our former description of the javelin bat, by confounding it with the American bat, mentioned by Seba, he, from a careful examination, being convinced of their being different species; and we feel ourselves indebted to this gentleman for the pains he has taken to rectify our mistake. THE SERVAL.