52 NATICA. 



N. UMBILICATA, Quoy. PI. 22, fig. 26. 



Shell thin, inflated, largely, obliquely, excavately umbilicated, 

 obscurely decussately striated ; subtransparent white with zigzag 

 longitudinal light chestnut markings, often interrupted to make 

 spiral series. Length, 'T5 inch. 



So. Australia. 



N. globosa, Tenison-Woods is a synonym. 



N. MACROTREMA, Ad. and Reeve. PL 22, fig. 27. 



Smooth, thin, very largety excavately umbilicated ; greenish 

 white. Length, 1 inch. 



Borneo. 



Perhaps a faded condition of the preceding species. 



Subgenus AMPULLINA, Lam., Defrance, 1821. 

 N. FLUCTUATA, Sowb. PI. 22, fig. 28. 



Obliquely globose, rather thin, polished ; light fawn-color, 

 obscurely darker banded, overlaid with zigzag white streaks ; 

 columella white, densely callous, bordered with chestnut, com- 

 pletely overlaying the umbilicus; interior whitish., interruptedly 

 banded with light chestnut. Length, 2-2'5 inches. 



Philippines. 



It is N. imperforata, Jay. 



Subgenus AMAURA, Moller, 1842. 



N. CANDIDA, Moller. PL 22, fig. 29. 



Thin, imperforate, bulimiform, with considerably elevated 

 spire ; white, under a thin epidermis. Length, 12 mill. 



Greenland. 

 Section ACRYBIA, H. & A. Adams, 1853. 



N. FLAVA, Gould. PL 22, fig. 30. 



Shell thin, subglobose ; aperture large, columella sinuous, a 

 little dilated above, umbilicus none ; white, under a thin straw- 

 colored epidermis. Length, 1 inch. 



Maine, Newfoundland, northwards ; 



Finmark, Nova Zembla, 

 N, aperta, Lovcn, and N. Smithii, Brown, are identical. 



