NATICA. 43 



except near the suture and at the base with orange-brown, the 

 latter sometimes evanescent in places, or obscurely banded. 



Length, 1-75-2-25 inches. 



China, Moluccas. 



X. Cumingiana, Recluz (fig. 99), and ? X. poZfc'ttm, Reclaz, and 

 N. Draparnaudi, Recluz (fig. 100), are synonyms. N. eff'usa, 

 Swains, (fig. 92), is probably a pale-colored variety. 



X. RAVIDA, Souleyet. PL 15, fig. 38. 



Deeply perspective!}- umbilicated, globose, very solid, body- 

 whorl slightly obliquely flattened above ; white, covered with 

 a thin, rough, horny j'ellowish epidermis, columellar callus very 

 strong, white. Length, 28 mill. 



Payta, Peru (Souleyet) ; St. Elena, W. Columbia (Cuming). 



X. ORIENTALIS, Gmelin. PL 20, figs. 1, 2. 



Widely globose, plicate at the deep suture; umbilicus broad, 

 with a white central entering callus, aperture produced below ; 

 orange-brown, vaiying to yellowish white. 



Length, 1-5-1-75 inches. 



Singapore. 



It is JN r . eburnea, Desh., X. subfulva, Chemn. 



X. MAMILLAHIS, Lam. PL 18, fig. 74. 



Conic ovate, deeply umbilicated, with a broad entering callus, 

 flesh-brown or orange-brown, base and columellar callus white. 

 Length, 2 inches. 



West Indies, Caribbean coasts of Central and South 



America, Baliia, Brazil. 



It is ^T. brunnea, Linck,and -N. Balnensis, Recluz. N. pallium 

 of the latter author (p. 42), which I have made a doubtful syno- 

 nym of N. Pou'lisiana, may belong here ; it closely resembles 

 the present species, but the locality differs widety. 



X. OTIS, Brod. and Sowb. PL 17, figs. 72, 70, 71; PL 19, fig. 91; 



PL 12, fig. 2. 



Conic ovate, yellowish white or light mouse-color, with a yel- 

 lowish or orange band at the suture; umbilicus open, chestnut- 

 brown, together with the central entering callus ; interior of 

 aperture chestnut-color. Length, 1-1-75 inches. 



Gallapagos Is. to Cape St. Lucas, L. Cal. 



