ters may prove to be accidental, ami not specific. It-rib-, which arc very slightly worn, have Inn-ami there a subnndulous aspect : upon the whole it approaches the typical sipho (which I regard a-perfectly distinct from exiffud), hut is i conic, with the ribs much more elevated, and with very distinct interstitial colouring. S. i:\ri.i m. S. testa parva, sol iff a, ovali-rotundata, pyrami-datosubdepressa, ntbeymmetriea, niffro-cteruletcente, cottis multis cinereis partis obtttsis plerumque alternatu hand confer-tim radiata : oertice centraU, kevi, nigro-fuscescente, rimplici, obtusiusculo : la/at' riphonifero aliquantulum majore : margine subintegro : pagina interna picea, ad apicem pallidiore, vel aubalbida, ad marginem albido breviesime radiata. Long. 7 lin., hit. (3 lin. Utih. Norfolk Island. Mus. Ilanley. Very distinct from any species known to inc. In the example described there are about forty unarmed ribs, of which a dozen upon the hinder two-thirds of the shell are peculiarly prominent, and spring immediately from the erect vertex. There are indication-of an epidermis, and of faint and crowded concentric Btriolae. S. uedimiculum, var. S. testa parva, tenui, ovato-oblonga, arcuatosubconica, fusco albidogue zonula ; costis elevatis, mu-ticis, snljcequalibus, rotundatis, aubdistanter radiata ,• lateribiu valde inagualibtu : vertice valde excentrico, postico, in juniori-bus ad-unco : costa siphonifera inconspicua : pagina tola interna fusco-pnrpurascenlc Long. Ga lin., lat. 4f lin. Hab. ? Mus. Hanley. The comparative smoothness and almost uniform external colour-ing of the previously described form of this remarkable-looking -hell have rendered it desirable to redescribe the species. No interstitial sculpture is present ; the ribs scarcely exceed twenty in number. 5. A Monograph of the Genus Nyctoimiilus. By Robert F. Tomes. The characters of the present genus were first briefly given l>\ Dr. Leach in a communication to the Linnean Society in March L820, which was not, however, published until L822. The paper is intituled, "The characters of seven genera of Bats with foliaceous appendages to the nose;" the -e\ei genera being Artibeue, Monophyllue, Mormoope, NyctophUue, Hfegaderma, I'um-pyrus, and Madateua. From the manmr in which NyctophiltU i-here associated with the other genera, it -eeins not unfair to assume that Dr. Leach re-garded it as more or less closely affined to them : and they, with the exception perhaps of Mormoopt, all appertain to the Phyllottm M . Temminck, in his monograph "i the genua, gives it as his opinion that it may properly be placed between BAinolopkuM ami
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