Shell oval, minutely punctured, spire obtuse; margin of the exterior lip within, and base of the inner lip thick and rufous; operculum horny? * * * * * This and _A. oblonga_ are the only species I am yet acquainted with, whose form is not globose. It never grows to a size much larger than the figure; the whole shell is marked by fine longitudinal striae, and transverse lines of minute dots, discernible only by the aid of a common magnifier; the aperture within is brownish flesh-colour; the margin is strong and reddish, and, within that of the outer lip, is a thickened rim; which, should the operculum be testaceous, may supply the place of the groove for its reception observable in _A. globosa_ and _corrugata_. The localities of both these species are unknown to me. * * * * * Pl. 144 [Illustration] EBURNA Valentiana, _Arabian Eburna._ * * * * * GENERIC CHARACTER. _Testa turrita, laevis, nitida, umbilicata, basi truncata, emarginata. Aperturae angulus superior interne canaliculatus. Animal marinum._ Shell turrited, smooth, polished, umbilicated, base truncated, emarginate. Upper angle of the aperture with an internal channel. Animal marine. Generic Type _Buccinum Spiratum_ Lin. * * * * * SPECIFIC CHARACTER. _E. testa ventricosa, maculata; aperturae longitudine spirae longitudinem superante; spira anfractibus 5 convexis, suturis alveatis; basi balteo concavo cincta._ Shell ventricose, spotted; spire shorter than the aperture, of five convex volutions; suture channelled; base with a concave belt. Eburna Valentiana. _Sw. Appendix to Bligh Cat._ _p._ 6. _lot_ 904. * * * * * Few species are known of _Eburnae_, and these are neither well defined, nor correctly figured. The species selected by most authors as the type of this genus is _Buccinum glabratum_ of Linnaeus, a shell which, as it unites the characters of _Eburna_ and _Ancilia_, should not have been chosen for this purpose. Types of genera are alone intended to represent the usual appearance of those characters on which the genus has been founded; they should therefore be selected from such species only, as represent these characters in their perfect development. _E. Valentiana_ was first characterized by myself, in the Appendix to the Bligh Collection. It was brought from the Red Sea by Lord Valentia, in honour of whom it is named. The very short spire and concave belt at the base, easily distinguish this shell from _E. spirata_. * * * * * Pl. 145 [Illustration] EBURNA tessellata, _Tessellated Eburna._ * * * * * GENERIC CHARACTER.--See Pl. 144. * * * * * SPECIFIC CHARACTER.