We have not yet sufficiently worked out this intricate and little known group: the very existence of which was first announced in North. Zool. 2, p. 156. According to our present views, the genera yet characterized appear to be _Crateropus_, _Malacocircus_, _Pellornium_, and _Timalia_. To _Crateropus_, we at present refer the sub-genera _Grallina_, Vieil, _Cinclosoma_, H. & V. and _Aipunemia_, Sw.; while those of _Malacocircus_ are probably _Megalurus_, H. _Pomatorhinus_, H. and _Leptonyx_, Sw. Under the genus _Timalia_, we place _Psophodes_ and _Dasyornis_, H. & V. * * * * * * [Illustration: MITREOLA. _1. monodonta. 2. terebellum. 3. Mitra acuminata._] MITREOLA monodonta, _The Volute Mitres._ ---- Family Volutidæ. Sub-family Mitranæ. Genus Mitreola. _Sw._ GENERIC CHARACTER. Shell fusiform, smooth; the middle plaits of the pillar largest apex of the spire generally papillary. ---- SPECIFIC CHARACTER. _Shell ovate, acute, smooth; spire slightly striated, the tip papillary; outer lip within, gibbous._ Mitra monodonta. _Lam. Syst. 7, p. 324._ ---- We feel much obliged to Mr. G. B. Sowerby for calling our attention to the remarkable construction of this Volute Mitre, of which we had not then seen a specimen. We view it as supplying that link of connection between the _Volutinæ_ and the _Mitranæ_, the Volute and the Mitre shells, which we had long been in search of. Of the genus, however, we know as yet but of two species, represented on the plate somewhat larger than their natural size. We have also added a figure of our _Mitra acuminata_, to shew how beautifully _Mitreola_ is represented by the fourth type of the genus _Mitra_, as now restricted, to which type (represented by _M. Zebra_), _acuminata_ also belongs: both, as prototypes of the _Strombidæ_, have the outer lip gibbous near the top; but the plaits of the pillar are totally different, while the spire of one is acute, and of the other papillary. _M. monodonta_ is a Grignon fossil: some specimens are so well preserved, that the colours may be traced in the appearance of zebra-like stripes: thus strongly corroborating our views on its true analogies. ---- MITRA terebellum. _Shell fusiform, turrited, smooth, base striated; channel sub-entire._ Mitra terebellum. _Lam. Sys. 7, 325. Ency. Meth. pl. 392, a, b, c, d?_ ---- Of this Grignon fossil, we have but one specimen: it agrees with Lamarck's description, but not with the figure he quotes; and it may possibly be a distinct species between his _M. plicatella_ and _terebellum_. The plaits are like those of _M. monodonta_; but the tip of the spire is acute, and slightly plaited. * * * * * * [Illustration: LEILUS _Occidentalis_. _Sw._] LEILUS Occidentalis, _West India Emerald-Butterfly._ ---- SPECIFIC CHARACTER. _Posterior wings with a flame-coloured, irregularly indented, marginal band; tails black, with emerald green spots._