Since we published the figure of _Oliva striata_, (Oliva, Pl. 1. f. 2.) we have procured the true _Ancillaria canalifera_ of Lamark, and find it as we suspected, a very different shell. As _Hiatula_ leads to the _Ancillariæ_, so does the sub-genus _Olivella_, (comprising the small operculated Olives) conduct us to the Mitres, by means of _Olivella volutella_, already figured in this work. We believe the _third_ aberrant form is represented by our _Oliva striata_, but we shall not proceed to characterize it as a sub-genus, until a better acquaintance with the group is obtained; its analogy to _Conohelix_, by its external sculpture, seems to us a strong ground of distinction. We procured all these wide-mouthed Olives from the Messrs. Stuchbury, to whom we are often indebted for the loan of interesting specimens. * * * * * * [Illustration: PIERIS LIMNOBIA. _S. G. Melete._] PIERIS (_Melete_) Limnobia. _Yellow-underwing White._ ---- Genus Pieris, Lat. CHARACTERS. _Antennæ_ as in _Euterpe_. _Palpi_ lengthened, the terminal joint linear, pointed, nearly naked, and longer than either of the two next. _Anterior wings_ trigonal, the exterior and the posterior margins of equal length: _posterior wings_ dilated. _Male_ with the terminal abdominal valves large, abruptly attenuated, and hooked. Type. Pieris Limnobia. Lat. & Godart. ---- SPECIFIC CHARACTER. _Anterior wings above yellowish white, with a black triangular exterior border, and a costal band in the female. Posterior above yellow, with an orange border, divided in the female, into round spots upon a black ground: under surface with a deep brown border, unspotted._ Pieris Limnobia. _Ency. Meth. 1 p. 144. No. 93._ ---- Lycimnia? _Cramer pl. 105. f. E. F. Ency. Meth. No. 92?_ ---- We found this pretty Butterfly in profusion near the woods of Mandioca, at the foot of the Organ Mountains of Rio de Janeiro; when in company with our learned friend Professor Raddi, now prosecuting his researches in Egypt: it appears late in the season, and frequents the flowery openings of thick woods. The female is without the black costal band, and the margins of the lower wings are simply orange. The accurate description of _Limnoria_ in the _Ency. Meth._ perfectly accords with our specimens; but we suspect the _Lycimnia_ of Cramer is also the same species.