38 NATJCA. 



N. SORDIDA, Phil. PI. 12, figs. 99, 100. 



Solid, striate longitudinally, reddish brown or orange-brown, 

 or yellowish white, white at the base ; umbilicus narrow, open, 

 spirally striate, usually reddish brown as well as the callus ; 

 interior of aperture whitish or tinged with brown. 



Length, 1*1 inches. 



England to Mediterranean, rare. 



With this must be united N. BroccMana, Phil., N. fusca, of 

 Weinkauff, not Blainville the latter being a somewhat doubtful 

 species, N. Inemda, Laskey, and N. plicatula, Reeve (fig. 100). 



N. COMPACTA, Jeffreys. PI. 14, fig. 31. 



Globular, thick, opaque, somewhat glossy, with a few micro- 

 scopical spiral striae ; light yellowish brown ; suture wide, slightly 

 channeled ; inner lip thickened, closing the umbilicus, but not by 

 a pad. Length, 9 mill. 



Atlantic, 0. (" Porcupine " and " Lightning " Expeditions). 



The young have the umbilicus open. 



N. SUBPLICATA, Jeffreys. PI. 14, fig. 32. 



Globular, rather thick, opaque, glossy, slightly wrinkled 

 striate at the suture ; ivory-white ; suture rather deep ; umbilicus 

 narrow. Length, 10 mill. 



Bay of Biscay, Off Cape Verd Is. (370-1192 fms.). 



N. ANGULATA, Jeffreys. PI. 14, fig. 33. 



This is an embryo only, and should not have been described. 

 Length, 1-25 mill. 



Atlantic, Mediterranean ( u Porcupine " Exped.). 



N. TENUIS, Recluz. PI. 14, fig. 25. 



Thin, dirty white, smooth, spire elevated, suture well impressed, 

 columellar callus thin, reducing the umbilicus to a rimate open- 

 ing. Length, 1 inch. 



Valparaiso. 

 N. IMMACULATA, Totten. PI. 12, fig. 7. 



Conically ovate, the extremities rather pointed, milk-white, 

 under a thin greenish yellow epidermis ; umbilicus narrow ; 

 inner lip with white callus. Length, 8 mill. 



New England, Nova Scotia, etc., to Greenland. 



With this I unite N. nana, Moller, a species described from 

 Greenland. 



