This bird obviously belongs to the Thrushes; but as I have not yet defined the extent of the genus to my own satisfaction, I refrain at present from proposing its characters. * * * * * Pl. 181 [Illustration] VOLUTA Pusio, _Dwarf Volute._ * * * * * GENERIC CHARACTER.--See Pl. 161. * * * * * SPECIFIC CHARACTER. _V. testa ovato-obtusa, flavescente, fasciis pallidis, maculis fulvis interstinctis cincta; anfractu basali obtuse nodoso; spira brevissima, acuta; columella incrassata, multiplicata._ Shell ovate-obtuse, yellowish, with pale bands and fulvous spots; body whorl crowned by compressed obtuse nodules; spire very short, acute; pillar thickened with many plaits. Voluta Pusio. _Swainson, in Tilloch's Ph. Journal_, _vol._ 61. _p._ 378. * * * * * Lamarck's recent account of this genus, in the last volume of his _Animaux_, contains but two species in addition to those long ago described by him in the _Annales du Mus._; thus omitting many of those new Volutes which of late years have been discovered. On the other hand, this naturalist has created five species from the varieties of _V. musica_ Lin. resting their characters on colour, bands, and the number of the lesser or spurious plaits on the pillar. It requires no argument to prove that these principles of distinction are the most uncertain he could have chosen; scarcely two specimens of _V. musica_ being found alike. These supposed species must, therefore, again merge into one. The shell before us has more important characters; the body whorl is quite smooth, but crowned by compressed truncated nodules; the spire remarkably short, and the tip acute; in other respects it approaches to _V. virescens_ Sol. (_Polyzonalis_ Lam.) and to _V. fulva_ Lam. I have neither of these shells at present before me; but if Lamarck's description of them, and the figures which he has cited, be correct, I have no doubt they are but one species; _V. polyzonalis_ being the _smooth_, and _V. fulva_ being the _nodulous_ variety of Solander's _V. virescens_. In fact, Lamarck says both shells are transversely striated. _V. pusio_ is a shell of the greatest rarity, and is described from a specimen in the collection of my friend Mr. Broderip. Its form is perfect, but its colours are somewhat faded. * * * * * Pl. 182 [Illustration] CYPRAEA spadicea, _Chesnut Cowry._ * * * * * GENERIC CHARACTER.--See Pl. 111. * * * * * SPECIFIC CHARACTER. _C. testa ovata, oblonga, immaculata; dorso rufo; ventre albo; lateribus lividis._ Shell ovate-oblong, unspotted; the back reddish chesnut; belly white; sides livid. C. spadicea. _Swainson, in Tilloch's Ph. Mag._ _vol._ 61. _p._ 376. * * * * *