424 Miscellaneous. length : plourn? dpiisoly porous, terminating in a blunt process, which is tipped with 4 or 5 small spines : sternite long and narrow, posteriorly attenuate, with truncate hinder edge, its basal width about two thirds of its length ; legs long and slender, nearly four times the length of the head, the segments cylindrical and about four times as long as wide ; femora armed with about 14 small spines, 3, 3, 2 in three longitudinal rows on the inner surface and 3, 3 in two rows on the external half of the lower surface ; the femoral process armed with from 4 to 10 small spines ; no tarsal spur, claws basally spurred. The rest of the letj!^ long and slender, with a tarsal spur. Measurements in millimetres. — Total length 103, of antenna 37, of anal leg 41 : width of head 10-5, length 10 : width of twelfth tergite 14, of twenty-first 8. Loc. New Georgia (Solomon Islands). A couple of specimens of this species were obtained by Commander Barker, R.X., of H.M.S. ' Penguin.' The second specimen is a little smaller than the type, be ng 145 millim. long, and much more uuitbrmly chestnut in colour. lu its general features this handsome new species presents con-siderable resemblance to the cosmopolitan S. suhsjiini/ies of Leach, but may be at once recognized by the spine-armature of its anal legs, the former species having only two or three spines on the lower surface of the anal femora and only three or four on the inner surface. It also has but five or six teeth on the precoxal plates of the maxillipedes, whereas in S. metuenda there are a large number of minute more or less obsolete teeth on these plates. In this respect *S. metmnda would seem to approach S. polyodonta, Daday (Term, fiizetek, xvi. p. 109 pi. v. fig. 7 &c.), from New Guinea ; but the latter has the anal femora unarmed, as in the variety of S. de Haanii named inermis by Newport. MISCELLANEOUS. On the Status of the Names Aplysia and Tethys. By Hexkt a. Pilsbrt. In the course of my studies on the " Sea-Hares,'" preliminary to the preparation of a monograph of this group of tectibranch mol-lusks for the ' Manual of Conchology," my attention was early forced to the fact that in Linnseus's tenth edition of the ' Systema Naturae ' the genus Tethjis was proposed for the animal now known as Aj)h/sia, and included nothing else. Moreover, by the terms of the generic diagnosis, such creatures as that known as Tdhys in modern times are excluded. In the twelfth edition of the ' Systema ' Ttthys is given a com-pletely different meaning, and the new term Aplysia (Laplysia) is brought forward to include the species of the earlier Tethys. Ihis later usage has been accepted by zoologists until the present day.