54 NIOTHA. 



resembles in its coloring and polished surface. That a series 

 could be arranged to show the gradual transition from one to 

 the other of these species, although arranged in different groups, 

 cannot be doubted. The synonyms are N. margimdata, Reeve 

 not Lam. (fig. 301), called .V. Kieneri by Deshayes, N. mar- 

 garitifera, Reeve, not Dunker (fig. 302), and .V. Isabe llei, Reeve, 

 not d'Orb. (fig. 303). 



N. LIVESCENS, Phil. PL 16, fig. 304. 



Yellowish, clouded with light chestnut. Length, -8-- 9 inch. 



India, Chinese Sea, Philippines. 



This species has the form of albescens, with the revolving 

 sculpture of cremata and ribs of concinna. 



N. PUSIO, A. Ad. PL 16, fig. 305. 



Fulvous, variegated and spotted with brown. 



Length, -28 inch. 



Luzon, Philippines, in coarse sand, at six fathoms Cuming. 



This shell is globosely oval, with fine ribs and rather incon- 

 spicuous revolving striae. 



N. MULTICOSTATA, A. Ad. PI. 1 6, tig, 306. 



White, variegated with pale red; revolving striae obsolete. 



Length, '7 inch. 



Philippines, coarse sand, at four fathoms Cuming. 



Proportionally longer, the ribs rather coarser, yet possibly an 

 older example of N. pusio. 



N. VEKRUCOSA, A. Ad. PL 16, fig. 307. 



Yellowish, clouded with reddish brown. Length, 1 inch. 



Philipp'mes. 



The tubercles are larger and more decidedly warty than in the 

 succeeding species, the sutural channel is deeper, the spire more 

 conical : } r et it possibly is only an intermediate form, between 

 xtigmaria and gemmulata. 



N. STIGMARIA, A. Ad. PL 16, tigs. 308-310. 



Whitish or yellowish, more or less clouded and marked with 

 brown. Sculpture forming flat, somewhat square-shaped gran- 

 ules, those forming a row around the deep (but not wide) suture, 

 somewhat larger. Length, *75-l inch. 



Philippines, Malacca, Indian Ocean. 



