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Show 290 Mil. H. ADAMS ON NEW MASCARENE SHELLS. [May 14, lariter striata, olivaceo-fulva; spira brevissime conoidea, apice obtuso, sutura submarginata; anfr. 6, planiusculis, ultimo non descendente, supra subangulato, basi paulum convexo ; apertm subverticali, lunari; perist. simplici, acuto, recto, marginibus conniventibus, columellari superne brevissime refiexo. Diam. maj. 9, min. 8, alt. 5 mill. Hab. Isle of Bourbon. , , This species is closely allied to N. Virginia, Morelet; but the whorls of the spire are almost flat instead of being convex, and the spiral lines are more stronglv impressed, while the animal, from the subjoined note of Mr. G. "Nevill, appears to differ considerably. " The animal is of a uniform black colour, and resembles that ot N. nitella ; that of N Virginia is yellow and black."-G. Nevill. Discus SERRATUS, H. Ad. (Plate XXVIII. fig. 6.) D. testa late ct profunde umbilicata, lenticulari, arctispira, subpellucida, parum nitente, liris elevatis sculpta, pallide spira convexa, sutura serrata; anfr. 6, convexiusculis, ultimo peripheriam serrato carinato, basi circa umbilicum rotundato; apertura obliqua, angulato-lunari; perist. simplici, acuto, Diam. maj. 6|, min. 5f, alt. 3 mill. Hab. Silhouette Island, Seychelles. ACICULA MAURITIANA, H. Ad. (Pl. XXVIII. fig. 7.) A. testa imperforata, subulato-cylindracea, tenui, hyalina, spira subcylindracea, apice valde obtuso, sutura impressa ; 5, planiusculis, ultimo basi dilatato; columella arcuata, vix apertura acuminato-ovali; perist. simplici, recto, acuto. Long. 4, diam. 1 mill.; ap. I3 mill, longa. Hab. Mauritius. VERTIGO (.\LAEA) BORBONICA, H. Ad. (Pl. XXVIII. fig. 8.) V. testa profunde rimata, oblongo-ovata, tenui, subleevigata, rufo-fusca; spira convexo-conica, apice obtuso, sutura anfr. 5, convexiusculis, ultimo basi subcompresso, aperturam tumido, scrobiculato; apertura truncato-ovali, subverticali, qu adr ident at a; dente 1 compresso, intrante in parietem 1 profundo in columella, 2 inpalato, supero minuto; perist. expansiusculo, albo-labiato, marginibus callo tenui junctis, subsinuato. Long. 2\, diam. l\ mill. Hab. Isle of Bourbon. GIBBUS (GIBBULINA) DESHAYESI, H. Ad. (Pl. XXVIII. fig. 9 ) G. testa profunde rimata, cylindrica, tenui, nitida, pellucida leviter striatula, pallide cornea; spira superna convexa sutura anguste marginata ; anfr. 9, convexiusculis, ultimo ascendente, bas, rotundato; apertura verticali, semiovali |