XKIUTA. 27 



the extremities of a row of fine denticles, inner margin with two 

 small teeth and a superior, quadrangular larger one. 

 Diam. 28 mill. 



Swan River, Australia. 



N. YOLDII, Recluz. PL 9, figs. 0.1-57. 



Faintly, closely spirally striate or smooth, yellowish white macula- 

 ted in a zigzag manner with black, sometimes black with white 

 markings, often with a light band on the darker specimens, or a 

 dark band on the lighter ones; aperture yellowish', the outer lip 

 dentate within, columellar margin minutely or obsoletely dentate 

 in the middle, area smooth or very faintly marked by a few tubercles. 



Diam: 18 mill. 



Red Sea, Indian Ocean, Hongkong. 



Sometimes this species, like some West Indian ones is subject to 

 an erosion which excavates the white portions leaving the black 

 in relief. N. Ixtu4n(in, Reeve (fig. 56), and N. Peruviana, Phil. 

 (fig. ~>7), which is not from Peru, are synonyms. 



Section PILA, Klein. 1753. 



N. PLICA TA, Linn. PI. 5, figs. 81-83. 



Shell .spirally ridged, with equal, excavated interstices, each 

 about 18-20 in number on the body whorl, whitish or brownish 

 white, here and there spotted and streaked with black ; lip crenated, 

 with several minor internal teeth, with a larger one at each extrem- 

 ity of the series, columellar margin with four strong teeth, columellar 

 region rugosely wrinkled. Diam. 15-30 mill. 



Indian Ocean, Formosa, Polynesia, Sandwich Is. 



Sometimes unicolored whitish, sometimes regularly tessellated 

 with black, or the spots so disposed as to form interrupted bands. 

 Occasionally very thick specimens occur in which the sculpture is 

 reduced to rugose striae or partially or wholly disappears. Entirely 

 black specimens are known as N. ringens, Reeve (fig. 83). Other 

 synonyms are: N. lactaria, Linn., N. Otaiensis, Lesson. 



N. COST ATA, Chemn. PI. 5, fig. 84. 



With about 12-15 strong spiral ridges, which are black, and 

 equal, with excavated yellowish olivaceous interspaces; lip crenula- 

 ted, toothed as in the preceding species, columellar area tuberculated 

 below the plications. Diam. 15-35 mill. 



Indian Ocean, East Indies, Japan, Australia, Philippines, etc. 



It is N. grossa, Born, and N. scabricosta, Delessert. 



