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Show 1868.] MS. H. ADAMS ON NEW MASCARENE SHF.LLS. 289 et liris multis rubris interruptis ornata; spira elevata, concava, apice mamillato; anfr. 6, supera angulatis et nodulosis; apertura angusta, antice paulum dilatata; labro postice recedente. Long. 12, diam. 5 mill. Hab. Isle of Bourbon. Fam. RISSOIDAE. Gen. NEVILLIA, H. Ad. Testa imperforata, acuto - ovata; anfractibus convexis, spiraliter liratis, longitudinaliter striatis. Apertura ovalis; columella callosa et dente introrsum desinente munita; labro acuto, intus leevigato, extus varicoso. This genus has much the resemblance of a minute species of Craspedotus ; but there is no indication of nacre within the aperture, and the tooth on the columella is more like that of Rissoa monodonta than of the former genus ; in its form and sculpture Nevillia approaches Alvania. I have dedicated it to Mr. Geoffrey Nevill. NEVILLIA PICTA, H. Ad. (Pl. XXVIII. fig. 2.) N. testa ovato-conica, solidula, costis spiralibus ineequalibus medio anfractuum una validiore) et striis minutissimis longitudinalibus sculpta; albida, maculis fulvis picta; spira conica, apice acuto, sutura distincta; anfr. b\, angulatis; apertura ovali ; dente columellari prominente; labro extus varicoso. Long. 2\, diam. 1^ mill. Hab. Mauritius. NEVILLIA LUCIDA, H. Ad. (Pl. XXVIII. fig. 3.) N. testa ovato-conica, solidiuscula, subpellucida, alba, costis spiralibus subdistantibus et striis minutissimis longitudinalibus sculpta spira conica, apice acuto, sutura impressa; anfr. 5, convexis; apertura subcirculari,- dente columellari valido, acuto; labro varice externo valido. Long. 2, diam. 1| mill. Hab. Isle of Bourbon. STYLIFER SPECIOSUS, H. Ad. (Pl. XXVIII. fig. 4.) S. testa imperforata, ovato-subulata, tenui, subpellucida, nitida, liris capillaceis distantibus cincta; spira sursum valde attenuata, sutura distincta; anfr. 11, apicalibus 6 stylinis, deinde convexis, ultimo rotundato; apertura sub lunari; columella recta, callosa; labro valde sinuato. Long. 10, diam. 4 mill. Hab. Mauritius. NANINA (MACROCHLAMYS) GEOFFREYI, II. Ad. (Pl. XXVIII. fig. 5.) N. testa minute perforata, depressa, tenui, vix nitente, sub lente minutissime spiraliter striatula, longitudinaliter obsolete irregu- PROC. ZOOL. Soc-1868, No. XIX. |