NESOPUP^ OP THE MASCARENE ISLANDS. 351 



Section Nesopupa proper. 



47. NESOPUPA GONIOPLAX n. sp. PL 33, figs. 8, 9, 10. 



The shell is ovate, cinnamon-brown, the peristoine more 

 reddish, the teeth paler. The surface has little gloss, and 

 under the microscope shows some rather weak growth- 

 wrinkles and a dense, very shallow pitting or minute mallea- 

 tion. The whorls are convex, the last having behind the lip 

 two furrows, one lateral, the other sub-basal, diverging for- 

 ward, and corresponding to the upper and lower palatal 

 folds. The aperture has subparallel sides, straight parietal 

 callus and strongly curved base, the peristome well expanded, 

 somewhat thickened, at the sinulus thinner and retracted. 

 The angular lamella is very strong, curved, joining the outer 

 lip, diverging forward from the very strong parietal lamella, 

 the inner end of which is bent towards the columella. There 

 is a small infraparietal, rather deep within. The columellar 

 lamella enters nearly horizontally, then deep within on the 

 axis after rising a little it turns downward forming a broad 

 plate, only imperfectly seen from in front but prominent from 

 the back (fig. 9). There is a small basal fold at the junc- 

 tion of columellar and basal margins. The upper and lower 

 palatal folds are sinuous, strong, and converge inwardly. A 

 small suprapalatal stands above them, making 8 teeth in all. 



Length 2.5, diam. 1.55 mm. ; 5 whorls. 



Mauritius (Morelet collection from Nevill, type 64093 A. 

 N. S. P.). 



The most remarkable character of this snail is the dilation 

 and deflection of the columellar lamella. Nothing of this 

 structure is seen in N. moreleti and others of that group, 

 which are otherwise similar. Though the shells came from 

 Nevill, according to Morelet 's label, I cannot find that either 

 G. Nevill or H. Adams described the species. The following 

 species is apparently its nearest affinity. 



48. NESOPUPA MICRA, new name. PL 33, fig. 4. 



The shell is deeply rimate, ovate-cylindric, thin, very lightly 

 striate, silky, brownish-corneous. Spire convex, apex obtuse. 



