24 ARCULARIA. 



N. ARCULARIA, Linn. PI. 1, figs. 9, 10. 



Light colored with dark zone, or dark with a light zone ; shoulder 

 noduled, with usually a rib-like fold arising from each nodule. 



Length, 1-1-25 inches. 



Philippines, Viti Ixles. 



N. laticostata , Marrat (not figured), is probably this species, 

 not adult. 



N. SULCIFERA, A. Ad. PL 7, fig. 11. 



Ash-color, banded with white, longitudinally subplicated, 



transversely ridged. Length, 1*25 inches. 



Algoa Bay. 



Probably only a variety of N. arcularia: the single specimen 

 known is abnormal in its appearance, and it is therefore not easy 

 to assign to it a definite place in the synonymy. 



N. PULL A, Linn. PL 1, figs. 12-14. 



The plications are much closer and more numerous than in 

 N. arcularia ; an incised revolving line separates the shoulder 

 extremity of these ribs, forming a row of nodules ; additional 

 incised lines cross the entire surface, but are most conspicuous 

 on the spire, and lower portion of the body whorl. 



Length, 1-1 '35 inches. 



Red fiea, Java, Philippines. 



N Rumjjkii, Hombr. and Jacq. (fig. 13), is synonymous. That 

 N. pulla is itself identical with N. arcularia, is demonstrable from 

 the series of specimens before me. 



In N. plicata, Bolt., the longitudinal ribs are less and the 

 revolving lines more prominent ; another similar variation of 

 sculpture has received the name N. Deshayesii, Homb. and 

 Jacq. (fig. 14). 



Subge-m* Arcularia, Link. 

 N. QIBBOSULA, Linn. PL 7, figs. 15-1*7. 



Light yellowish or ash-color, banded, flecked, or blotched 

 with white or darker shades ; edge of callus frequently defined 

 on both sides of the back by an orange-colored line ; callus 

 whitish ; within the aperture yellowish. Length, '75 inch. 



Mediterranean Sea. 



