_Shell reverse, thin, smooth, whitish, with an Olive epidermis finely striated longitudinally; lower half of the basal whorl much contracted: spire prominent, obtuse; operculum horny; umbilicus large, open, the margin obtusely carinated._ ---- The shell from which our figure was taken we received from Mr. G. Sowerby, under the name of _Nilotica_, some years ago. Whether it is the same, or specifically distinct from Lamarck's _Guinaica_, we have no means of judging, otherwise than from the figures he cites of Chemnitz. If these are accurate, there are many points of difference; but no doubt the Editor of the _Bulletin des Sciences_, will have great pleasure in setting us right upon this subject. On attentively comparing the descriptions, given by Lamarck, of eleven species of _Ampullaria_, with those we have characterized in different works, we can only discover two instances wherein the same species have been mentioned by both parties, under different names. Our _A. conica_, is probably Lamarck's _virens_, and belongs to the genus _Pachystoma_, Guild. The other instance is curious; in the Appendix to the Bligh Collection, we described a remarkable variety of _A. fasciata_, under the sub-specific name of _Canaliculata_. In the following month appeared the second part of Lamarck's _Système_, wherein this variety appeared as a _species_, under the very same name. It would almost appear as if the two accounts had been written at the same moment. We have since had good reason to be confirmed in our suspicion as to this shell being a mere variety of _fasciata_, from a fine series of specimens sent us from Demerara. We take this opportunity, however, of expressing a belief that our _A. leucostoma_, is the young shell of _rugosa_. * * * * * * [Illustration: STOMBUS. Pl. 1. _S. Peruvianus_] STROMBUS Peruvianus. ---- Order Zoophaga. Family? Strombidæ. Genus Strombus.--_Lam. Sys. 7. 199._ ---- SPECIFIC CHARACTER. _Shell ponderous, nodulous, spire very small, depressed; outer lip above produced and attenuated, margin reflected; aperture striated._ Strombus Peruvianus. _Sw. in Phil. Mag. 62, p. 377._ ---- We first recorded this singular-shaped Strombus from a specimen sent from the Coasts of Peru. Others, from the opposite side of the American Isthmus, collected near Panama, have more recently come into the possession of our friend, the Rev. J. Bulwer, F.L.S. Its general form is not unlike _S. gallus_, but the spire is unusually depressed, and the aperture deeply striated: the upper surface is marked by parallel grooves, and one of the nodules is particularly large.