_Animal_ hermaphrodite, snail-like; the head bilobed, and bearing four tentaculæ, two of which are long and terminated by the eyes; mandibles greatly lunated, with a small transverse mouth and a triangular cutaneous plate; mantle perforated. _Eggs_ large, externally calcarious. _Shell_ oval, ventricose, the two last spiral whorls very short, but elevated; aperture entire, elongated; outer lip thickened and reflected; inner lip thin, nearly obsolete; pillar with a strong compressed inflexed plate. _Guilding._ ---- SPECIFIC CHARACTER. _Shell irregularly and minutely corrugated, and longitudinally striated; marked beneath the olive epidermis with oblique, undulated, dark stripes._ Carychium undulatum (1814). _Leach. Zool. Mis. 1. pl. 35._ Auricula caprella (1822). _Lam. Sys. 6. 2. p. 140. Chemnitz pl. 176, f. 1701.-2._ Plecocheilus undulatus. _Guilding in Zool. Journ. 3. p. 532._ ---- The pleasure which our scientific brethren will receive from possessing this copy of Mr. Guilding's beautiful drawing, will be changed into regret on knowing that the gifted hand which originally traced it is now cold. A liver complaint, doubtless brought on by too much exposure to a tropical sun, terminated the mortal career, a few months ago, of this accomplished Zoologist and excellent man. The name of Guilding now belongs to posterity. His loss, and that too in the prime of life, leaves a blank in the ranks of science, which there is no one so qualified to fill; where can we look for profound and indefatigable research, matured knowledge, a ready pen and an exquisite pencil, all employed unceasingly to illustrate _from life_ the animals of tropical regions. The search, unfortunately, will be fruitless. May his spirit now be with that God whose minister he was, and whose works upon earth it was his purest delight to study. This noble species was discovered by Mr. Guilding, in great numbers, upon the trunks and branches of trees in the forests of St Vincent: its eggs are hard like those of a bird, and the young shell resembles that of a _Succinea_. In _Carychium_ the eyes are at the _base_, but here they are at the _tips_ of the tentaculæ. * * * * * * [Illustration: PROTESILAUS _Swainsonius_.] PROTESILAUS Swainsonius, _Swainsonian Swallow-tail._ ---- Sub-family Papilionæ. Genus Amphrisius. Sub-genus Protesilaus. _Nob._ SUB-GENERIC CHARACTERS. See pl. 93. ---- SPECIFIC CHARACTER. _Wings pale straw-colour; anterior with a forked band near the black exterior margin, and another much shorter towards the middle, both black._ Papilio Swainsonius. _Langsdorff_, MS.S. Mus. Nost. ----