46 NATICA. 



columellar callus chocolate-colored, broadly reflected, nearly 

 covering the similarly colored narrow umbilicus. 



Length, 30 mill. 



Singapore, Philippines. 



The synonyms are N. lupinus, Desh.; N. melanostoma, var. of 

 Gmelin, and N. cinnamomea, Menke. 



N. INTEMERATA, Phil. PL 18, fig. 83 ; PI. 19, fig. 93. 



White, deeply mnbilicated with a central obtuse entering 



callus. Length, 1'5 inches. 



Mazatlan. 



N. alabaster, Reeve (fig. 93), is identical. Carpenter thinks it 

 a variety of N. uber, Val.; this is not unlikely, but if so, it estab- 

 lishes a range of variation in form, umbilicus and callus, which 

 may reduce the white Mammas to a single species. 



N. CANDIDISSIMA, Le Guillou. PI. 16, fig. 49 ; PL 19, fig. 95. 



Globosely neritoid, very solid, whorls polished, ivory-white; 

 callus broad, slightly entering the rather wide umbilicus. 



Length, 33 mill. 



Moluccas, North Australia. 



Is N. Jukesii, Reeve (fig. 95) == N. candidissima, Recluz. 



N. PIIYTELEPHAS, Reeve. PL 19, fig. 97. 



Globosely ovate, with sharp spire and linear suture ; white, 

 under a very thin horny white epidermis showing indistinct 

 revolving lines ; umbilicus compressed, with a slight central 

 entering callus, the columellar callus above often obsoletely 

 divided by spiral depressions. Length, 1-25 inches. 



Australia. 



Perhaps not distinct from N. candidissima. 



N. UNIMACULATA, Reeve. PL 19, fig. 96. 



Pyriform ovate, compressly umbilicated ; white, under a very 

 thin horny white epidermis ; columellar callus white, with a 

 central projection entering the umbilicus, and chestnut-spotted 

 on the face. Length, 1-25-1 "5 inches. 



Panama, Mazatlan. 

 N". ZOOLOGICA, Jousseaume. PL 20, fig. 3. 



Somewhat inflated, solid, white ; angulated around the widely 

 open umbilicus ; columellar callus rather narrow, chestnut tinged 

 below. Length, 57 mill. 



Hab. unknown. 



