50 NATICA. 



N. FLEMINGIANA, Recluz. PI. 16, figs. 51, 53 ; PL 15, fig. 44. 



Conically ovate, white, with a dense callosity almost covering 

 the umbilicus. Length, 1-1*5 inches. 



China, Philippines, Australia, Viti Islands, etc. 



Only distinguished from N. mamilla by its umbilicus, and 

 probably a form of that species. N. Vavaosi, Le Guillou (fig. 

 44), and N. galactites, Phil. (fig. 53), are synonyms. 



N. GLABELLA, Reeve. PI. 21, figs. 10, 11. 



Narrowly deeply umbilicated, subfusiformly oblong, rather 

 s*olid ; columella with a broadly reflected callosity above ; trans- 

 parent white, flesh-tinged, callosit}^ flesh-colored. Length, 13 mill. 



Hob. unknown. 



Reeve figures this as a reversed species, but does not so describe 

 it; Sowerby's figure is dextral. 



Section MAMILLA, Schum., 1817. 

 N. MELANOSTOMA, Gmel. PI. 21, figs. 13-18 ; PI. 22, fig. 21. 



Smooth, polished, with obsolete engraved spiral lines; llcsli- 

 white, obscurely banded with light flesh-brown, columella and 

 umbilicus chocolate-colored. Length, l'5-2 inches. 



East Indies, Philippines, Western Polynesia, 



Mauritius, Madagascar. 



The above diagnosis will define the species in a restricted 

 sense ; the variations of form and coloring are numerous, and it 

 would be easy to include most of the other species as varieties 

 at the most. 



N. opaca, Recluz is a synonym. 



Yar. ZANZEBARTCA, Recluz. Fig. 15. 



Shell a little more quadrangular in shape than the type, the 

 striae more strongly impressed, the brown bands broken up into 

 series of irregular longitudinal markings. 



Yar. MELANOSTOMOIDES, Quoy. Figs. 16, 21. 



Founded on thin, young specimens, with the bands broken up 

 into chestnut spots, frequently becoming obsolete. Washed-out 

 specimens of this form are N. Sebse, Souleyet (fig. 16). Very 

 probably the unfigured N. bicincta, Recluz, is also an example of 

 this variety. * 



