In shape and general aspect this shell somewhat resembles _C. onyx_; but its colours are so peculiar, that it cannot be mistaken for that or any other known species: the under side (or belly) is convex and pure white; the sulcations between the teeth of the aperture wide, short, and but faintly marked; the sides livid, tinged with flesh colour. Three specimens have fallen under my observation; one of which, being young, showed the internal colour of the back to be dull purple; they were all received by Mrs. Mawe from the South Seas. * * * * * CYPRAEA sanguinolenta (_Middle figures._) * * * * * _C. testa ovato-oblonga, dorso punctis fuscis, nebulosis, obsito; lateribus incarnato-violaceis, livide guttatis; ventre depresso._ Shell ovate-oblong, the back clouded, and dotted with brown; sides flesh-coloured violet, with dark livid spots; belly depressed. _C. testa ovato-oblonga, cinereo-caerulescente, fulvo vel fusco fasciata, lateribus incarnato-violaceis, sanguineo-punctatis._ _Lam. Syst._ 7. _p._ 396. C. sanguinolenta. _Gmelin_, 3406. _Turton_, 4. _p._ 335. _Dill._ 445. _Martini_, 1. _t._ 26. _f._ 265, 266. _Ency. Meth._ _pl._ 356. _f._ 12. C. purpurascens. _Sw. in Tilloch's Ph. Mag._ 61. _p._ 376. * * * * * Gmelin and Lamarck have both described the lateral spots on this shell as blood-red. Their descriptions in other respects are loose, and the figures by Martini so bad, that it is with some doubt I have here placed my _purpurascens_ as a variety of Gmelin's _sanguinolenta_. The back of the shell is minutely freckled with brown; the under part (or belly) is flattened; the spots on the sides dark livid purple, and the base of the aperture effuse. It is, I believe, a native of Southern Africa. * * * * * GENERAL INDEX OF LATIN AND ENGLISH NAMES TO VOL. III. IN THE ORDER OF PUBLICATION.