It is not improbable that _Mitra bifasciata_, (_Zool. Ill._ _pl._ 35.) may eventually be considered only a variety of the shell here figured, which accords much closer with the characters given of the Linnaean _M. caffra_, than any other; the two shells, however, at the first glance, have a widely different appearance; yet not more so, than the smooth and plaited varieties of _Strombus vittatus Lin._ I have therefore retained the character given by Lamarck, as the best method to be followed in doubtful cases. In this shell, the plaits commence halfway round the body whirl; they are obtuse, crowded, and not angulated near the suture; the striae between are fine and decidedly marked; the base half of the shell strongly grooved; the suture rather compressed; the channel short and not recurved, and the aperture striated. * * * * * MITRA crassa _Thick Mitre--upper and lower figures._ * * * * * _M. (div. 3.) testa laevi, media crassa, fusca, fascia angusta sub-alba ornata; spira striata, striis intus punctatis; labio exteriore dentato; columella 5 plicata._ Shell smooth, thick in the middle, brown, with a narrow whitish band; spire striated, the striae with internal punctures: outer lip crenated; pillar 5 plaited. A species evidently unknown to Lamarck; the upper margin of each whorl is thick and projecting; the striae on the body whorl are nearly obsolete, but on the spire become deep, remote, and having internally minute hollow dots; the inner margin of the exterior lip is strongly crenated, the aperture smooth, and the pillar with five strong teeth. I believe it was brought from the South Seas. * * * * * Pl. 89 [Illustration] PSITTACUS murinus, _Grey-breasted Parakeet._ * * * * * GENERIC CHARACTER.--See Pl. 1. * * * * * SPECIFIC CHARACTER. _P. viridis, genis, auribus, gulaque cinereis; vertice, remigibus rectriciumque marginibus sub-caeruleis._ Green; sides of the head, ears, and throat, grey; crown, quills, and end of the tail, bluish. P. murinus. _Gmelin._ 1. 327. _no._ 80. _Lath. Ind. Orn._ 1. p. 101. Grey-breasted Parrakeet. _Lath. Syn._ vol. 1. 247. _Gen. Zool._ vol. viii. p. 456. * * * * * Those of our readers who visited Leamington during the last season, may have observed this noisy little creature uttering its discordant cries at the door of a small house near the pump-room. I borrowed it for a day from the good woman to whom it belonged, and thus made the drawing and description with the bird before me.