1868.] Ma. H. ADAMS ON NEW MASCARENE SHELLS. 289 



et liris muUis rubris interruptis ornata ; spira elevata, concava, 

 apice mamillato ; arifr. 6, supera angulatis et nodulosis ; apertura 

 angusta, antice paulam dilatata ; labro postice recedente. 



Long. 12, diam. 5 mill. 



Hab. Isle of Bourbon. 



Fam, EissoiD^. 

 Gen. Nevillia, H. Ad. 



Testa imperforata, acuta- ovata ; anfractibus convexis, spiraliter 



liratis, longitudinaliter striatis. Apertura ovalis ; columella 



callosa et dente introrsum desinente munita ; labro acuta, intus 



Icevigata, extus varicosa. 



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 mono- 



donta than of the former genus ; in its form and sculpture Nevillia 



ajiproaches Alvania. I have dedicated it to Mr. Geoffrey Nevill. 



Nevillia picta, H. Ad. (PI. XXVIII. fig, 2.) X^t-^ 



N. testa ovato-conica, solidula, costis spiralibus incequalibus (in 

 media anfractuum una validiore) et striis minutissimis longitudi- 

 nalibus sculpta ; albida, tnaculis fulvis picta ; spira conica, apice 

 acuta, sutura distincta ; arifr. 5^, angulatis; apertura ovali ; 

 dente columellari prominente ; labra extus varicosa. 



Long. 2\, diam. \\ mill. 



Hab, Mauritius. 



Nevillia lucida, H. Ad. (PI. XXVIII. fig. 3.) 



N. testa ovato-conica, solidiuscula, subpellucida, alba, costis spirali- 

 bus subdistantibus et striis minutissimis longitudinalibus sculpta ; 

 spira conica, apice acuto, sutura impressa ; anfr. 5, convexis; 

 apertura subcirculari ; dente columellari^ valido, acuto; labro 

 varice externa valido. 



Long. 2, diam. 1| mill. 



Hab. Isle of Bourbon. 



Stylifer speciosus, H. Ad. (PI. XXVIII. fig. 4.) 



S. testa imperforata, ovato-subuluta, tenui, subpellucida, tiitida, lac- 

 tea, liris capillaceis distatitibus cincta ; spira sursum valde atte- 

 nuata, sutura distincta; anfr. 1 1, apicalibus 6 stylinis, deinde con- 

 vexis, ultimo rotundata ; apertura sublunari; columella recta, 

 callosa ; labro valde sinuata. 



Long. 10, diam. 4 mill. 



Hab. Mauritius. 



Nanina (Macrochlamys) geoffreyi, II. Ad. (PI. XXVIII. / ia 



fig. 5.) 



N. testa minute perforata, depressa, tenui, vix nitentc, sub lente 

 minutissime spiraliter striatula, longitudinaliter obsolete irregu- 

 Proc. Zool. Soc— 1868, No. XIX. 



