376 Zoological Society : — two distinct tubes is not a distinctive character of Furcella, as we have in the British Museum a Teredo or rather a Xylotrya from Sierra Leone which has some of its tubes furnished with two distinct siphonal apertures, others in which the tubes are only partially separated, and others with a simple aperture. The " Cloisonnaine de la Mediterranee" of M. Matheron (Annales des Sciences et de 1' Industrie du Midi de la France, vols. I & 2), quoted by Deshayes (Ann. Sci. Nat. xi. 245), is evidently a Teredo, furnished with shelly valves and palettes, and not a Furcella. On a New Genus and several New Species of Uropel-tidjE, in the Collection of the British Museum. By Dr. J. E. Gray, F.R.S., V.P.Z.S., F.L.S., Pres. Ent. Soc. These animals, when first discovered, were arranged with Typhlops by Schneider ; and afterwards Cuvier, who had previously regarded them as belonging to that genus, formed for some of them a genus under the name of Uropeltis. In the 'Catalogue of the Specimens of Lizards in the Collection of the British Museum' (12mo, 1845), I formed for them a family under the name of TJropeltidce, and di-vided the species into three genera, each containing a single species. 1 lately described a fourth genus named Morina in the ■ Proceed-ings ' of this Society (1858). Professor Johann Miiller, in an article on the " Osteology of Rep-tiles M in Tiedemann's 'Zeitschrift fur Physiologic* for 1831 (vol. iv.), gave an account of the osteology of the two genera Rhinophis and Uropeltis. Schlegel in 1837 regarded them as a genus under the name of Pseudotyphlops, and noticed three species. Instead of this family being characterized by the tail being " cylin-drical, obliquely truncated above," it ought to be described as tail cylindrical or compressed, covered with keeled scales, which are separate or more or less united into a horny shield, — the scales on the tip of the tail being always united and many-keeled. Having occasion to re-examine the various specimens which we have received since the printing of the Catalogue above referred to, I have found several additional species. The family may be divided into three groups, according to the form of the tail. I. The tail obliquely truncated with ajlat superior disk. 1. Siloboura. Disk oblong, covered with separate, two or four keeled scales. 2. Uropeltis. Disk circular, covered with a single tubercular plate.