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Show 136 MR. G. NEVILL ON THE [Feb. 17, specimen has only six whorls, the last markedly larger than any of the others. Long. 7-}, diam. (vix) 2 millim. Indian Museum, Calcutta. GECILIANELLA, sp. Four or five specimens from deposit F, apparently identical with a unique specimen from Alassio. The first three whorls are more convex ; and all of them increase more regularly than in the next species. The last whorl is peculiarly evenly convex. Long. 4|, diam. 1} millim. Indian Museum, Calcutta. GECILIANELLA (? MERIMEANA, Bourg.). A small form of five whorl.7*, with short spire and very convexly swollen last whorl. Fairly abundant in the submaritime zone. This may be the C. merimeana of Bourg., from Cannes (Desc. Moll. Alpes-Marit., long. 5, diam. lg millim.), which, however, is described as having six whorls. Long. 4-|, diam. l-§ millim. Indian Museum, Calcutta. ACME FOLINIANA, G. Nevill. (Plate XIV. fig. 4.) Testa turrito-elongata, imperforata, cornea, Icevis et nitida ; spira subrecla, paululum prope apicem obtusum eversa ; anfractus 6 aut 6} [rarissime 7], convexiusculi, sutura distincta separati, interdum inferne linea incisa (more Eulimidarum) circum-dati; apertura subcorticalis, subquadrangularis, marginibus callo lavi junctis, columellari subrecto ; peristoma album, percrassum, duplex. Type, anfr. 6}, long. 5|, diam. If; apert. 1}, lat. ly1^ millim. This was an exceedingly abundant form, often in a perfect state of preservation, in deposits A, B, and C. A few specimens had 7 well-developed whorls, the others 6 or 6\, increasing very gradually and regularly, moderately convex, the last two approximate, of equal breadth; apex blunt and obtuse; the apical whorls with a slight inclination to the right (away from the axis of the shell); perfectly smooth, polished, shining, of a more or less pale horny colour, sometimes so transparent that the columella can be traced from the apex to the base ; suture distinct, with a more or less obsolete incised line close below it, as in many species of Eulima &c.; aperture a trifle everted, subquadrate, with a remarkable pure white callous rib close to the peristome, imparting a duplex appearance to the latter; a thin callosity joins the margins. I have much pleasure in naming this, the giant of its genus, after my friend the Marquis de Folin, of Bayonne, whose researches connected with minute marine species are so highly valued and appreciated. Type, Indian Museum, Calcutta ; also in coll. Marquis de Folin, |