NATICA. 37 



N. Patagonica, Phil. PI. 14, fig. 24 ; PL 21, fig. 12. 



Shell globose, solid, smooth, white, suture profound, umbilicus 

 narrow. Length, 1*4 inches. 



Straits of Magellan. 



N. globosa, King (unfigured), from the same locality", appears 

 to agree in description, except that it is said to be thin. Per- 

 haps ^^. Magellanica^ Phil. (fig. 12j, maj^ also be referred here. 



N. ATROCYANEA, Phil. PI. 14, fig. 21. 



Ovately globose, rather thin, bluish or bluish-white, with a 

 white band at the suture, and white also at the base ; umbilicus 

 narrow ; interior and columella chocolate-colored. 



Length, 1*5 inches. 



Straits of Magellan. 



N. FoRTUNEi, Reeve. PI. 14, figs. 22, 23 ; PI. 9, fig. 72 ; PI. 21, 

 fig. 9, 



Conically globose, with elevated spire and well-marked suture, 

 umbilicus narrow, slightly contracted by callus above ; j^ellowish 

 white to brownish, interior tinged with chocolate. 



Length, 42 mill. 



China. 



Reeve's example was a young one (fig. 22), and resembles 

 Xatica tenuis, Philippi (not Reeluz), so closel}' (fig. 9), that I 

 am inclined to consider that shell also identical ; although it is 

 said to be as thin as paper, whilst Forticnei is of medium thick- 

 ness. The name tenuis was used at an earlier date by Reeluz. 

 Perhaps N. gilva, Phil. (fig. 72), is identical ; if so, the name will 

 take precedence. 



N. PALLIDA, Brod. and Sowb. PI. 14, figs. 27, 2(;, 28 ; PI. 13, fig. 

 15; PI. 9, figs. 76-78. 



Ovatelj' globose, narrowly umbilicated, smooth, dirty white 

 under a yellowish brown thin epidermis. Length, 28 mill 



Arctic Seas — circumboreal ; Maine, Massachusetts. 



N. borealis, Gra}' (fig. 76) ; N. alba, Loveu ; N.pusilla, Gould, 

 Forbes and Hanley (not Say) (fig. 78) ; N. Groenlandica, Beck 

 (fig. 35) ; N. lactea, Loven ; N. ft?//6o.sfl, Reeve (fig. 77), probably 

 X. Beverlii, Leach; N. Gonldii, Phil. (fig. 15); N. suturalis, 

 Gray (fig. 28) ; N. livida, Laskey ; N. caurina, Gould (fig. 26), 

 are synonyms. 



