46 NATICA. 



columellar callus chocolate-colored, broadly reflected, nearly 



covering the similarlj^ colored narrow umbilicus. 



Length, 30 mill. 



Singapore^ Philippines. 



The S3'non3^ms are N. lupinus, Desh.; N. melayiostoma^ var. of 



Gmelin, and N. cinnamomea, Menke. 



N. INTEMERATA, PMl. PI. 18, fig. 83 ; PI. 19, fig. 93. 



White, deeply umbilicated 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. uher, 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. PL 16, fig. 49 ; PI. 19, fig. 95. 



Globosely neritoid, very solid, whorls polished, ivor3-wliite ; 



callus broad, slightly entering the rather wide umbilicus. 



Length, 33 mill. 



Moluccas, North, Australia. 



Is N. Juhesii, lleeve (fig. 95) = N. candidissima, Recluz. 



N, PHYTELEPHAS, Reevc. PI. 19, fig. 97. 



Globoselj^ ovate, with sharp spire and linear suture ; white, 

 under a verv thin horn}" white epidermis showing indistinct 

 revolving lines ; umbilicus compressed, with a sliglit central 

 entering callus, the columellar callus above often obsoletely 

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



A ustralia. 



Perhaps not distinct from N. candidissima. 



N. UNiMAcuLATA, Rceve. PI. 19, fig. 96. 



Pyriform ovate, compressly umbilicated ; white, under a verv 

 thin horn}' white epidermis ; columellar callus white, with a 

 central projection .entering the umbilicus, and chestnut-spotted 



on the face. Length, l-25-l*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. 



