328 CLATTSILIID^E. 



only just been formed, and the margins are consequently not 

 thickened or dilated, while there is a sinus at the upper parietal 

 fold. The walls of the shell also are thin and translucent. 



290. Clansilia nicobarica, sp. n. 



Shell rimate, fusiform, fuscous, very closely invested with fine 

 slightly wavy striae, more prominent and wavy on the last whorl, 

 and showing traces here and there of indistinct spirals. Spire 

 turreted, gradually attenuated, the sides almost straight ; apex 

 acute ; suture superficial. Whorls 10-J-, slightly convex, the last 

 considerably narrower than the penultimate. Aperture oblique, 

 the basal margin curving forward, pyriform. Parietal folds diver- 

 gent, the upper interrupted, rather slight and low; the lower 

 more elevated and stouter, deflexed towards the right margin, 

 not reaching the edge of the peristome. Palatal plicae two, the 

 upper long, parallel with the suture ; the lower close to the upper, 

 short, curved. Peristome solute, the margins expanded and 



Fig. 114. Clausilia nicobarica. 



reflexed, scarcely thickened, left margin descending obliquely 

 outwards, parietal margin without a sinus at the upper fold. 



Long. 24'5, diam. 5-2 mm. 



Hob. Nicobar Islands. Type in Mr. Leman's collection. 



The shell upon which this new species is based occurred in the 

 Beddome collection, and was labelled wuellerstorfi, but it is quite 

 distinct. It differs in being darker, more solid and opaque, and 

 is also considerably larger, although it only possesses one half 

 whorl more than ivuellerstorfi ; the aperture is larger and of a 

 different shape, the left margin descending outwardly, besides 

 being obliquely directed forward below, whereas in its ally it is 

 directed backwards. The parietal margin of the peristome has 

 no sinus at the upper fold, the latter, moreover, being interrupted, 

 while the lower fold approaches nearer to the upper, is stouter 

 and more elevated, and obliquely deflexed towards the right 

 margin, but does not reach the edge of the peristome, as is the 

 case in the other species. Lastly, there are only two, instead of 

 three, palatal plicae. 



