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Show 106 MR. G. NEVILL ON THE [Feb. 17, ment. I take mine from the base of the outer margin of aperture to the apex. It is quite specifically distinct from the following allied species, which take its place at 3000 feet or so. Alt. 7, diam. 15 ; apert. alt. 6, lat. 7$ millim. Specimen of seven whorls, from Menton. HYALINA EUGYRUS, Stabile (Moll. Lugano, p. 51, 1859; fide cl. Bourg. = //. cellaria, var. villce, Stabile, Moll. Pie'mont, 1864, - H. villce, Mortillet, not of Deshayes, Giorn. Mai. 1853). I am indebted for this identification to M . Bourguignat. Mr. Williams found the species rather searce on the " Berceau" and " Grand Mont," from 2500 to 4000 feet. It has six whorls of very fragile substance, spire almost flat, umbilicus very open and shallow, periphery more compressed than in the preceding, columella much more oblique, &c. Alt. 51, diam. 13 ; apert. alt. 5, lat. 6^ millim. HYALINA BLAUNERI, Shuttl. (Mitth. Ges. Bern, 1843, Corsica; = Helix lucida, Drap., var. compressa, Dumont & Mortillet, Moll. Savoie, 1852). An abundant form in the submaritime zone; it does not appear to occur at any considerable altitude, at least near Menton ; we found nothing like it subfossil. Young specimens bear perhaps a faint resemblance to Hyalina fodereana, Bourg. M S . I very much doubt if H. blauneri can be specifically separated from H. lucida; I have thought it best to do so temporarily. The present form is quite distinct from a more openly umbilicate shell from Lucca, which I received as " H. lucida," but which is nearer H. blondiana, indeed scarcely separable! Alt. 5f, diam. 124;; apert. alt. 4|, lat. 6 millim. Submar. zone, Menton. Animal entirely of a dark slate colour ; sole and sides of foot of a trifle more greenish hue. HYALINA MACEANA, Bourg. (Zonites maceana, Bourg. Descr. Moll. Alpes-Marit. 1869 ; near Grasse; alt. 4\, diam. 13 millim.) A well-marked and most distinct species, unmistakable for any other with which I am acquainted. Subfossil, it abounds at Menton, in deposits A, B,C, D; we found a single specimen in F. It occurs here and there along the coast as far as Monaco. Mr. Williams found it rather scarce, living on the " Grand Mont," at nearly 4000 feet. Alt. 5, diam. 12; apert. alt. 4|, lat. 5g millim. Var. PLANORBIOIDES, nov. (an potius Hyalina planorbioides, n. sp.1). A singular Planorbis-Yike variety with sunken spire ; the last whorl increasing more rapidly in proportion, more compressed at the periphery and (near the aperture) raised above the preceding |