NATICA. 53 



Section Amauropsis, Morcli, 1851. 



N. HELicoiDES, Johnson. PI. 22, fig. 31. 



Thin, with channeled suture ; umbilicus a narrow line ; chalky 

 white, covered with a light yellowish brown epidermis. 



Length, 1-1*5 inches. 



Newfoundland^ Arctic Ocean, Norioay, Siheina. 

 It is N. canaliculata, Gonid, N.fragilis, Leach, N. cornea, 

 Moller, and perhaps N. Islandica, Gmelin. 



N. PURPUREA, Dall. PI. 22, fig. 32. 



Suture channeled, umbilicus a mere chink or closed, inner lip 

 with a thin callus ; whorls 4, inflated, with fine revolving grooves ; 

 purplish brown, under a yellowish epidermis. Length, 1 inch. 



Alaska. 



Diftcrs from the preceding species in sculpture and color, and 

 is usually more globose. 



N. GLOBULUS, Angas. PI. 22, fig. 33. 



Rimate, rather thin, shining; orange horn-color, much paler 

 on the last whorl towards the aperture ; two narrow concentric 

 raised keels on the subapical whorl ; nearly smooth, a few 

 microscopical spiral strife here and there crossing the growth- 

 lines ; columella slightly thickened and expanded over the um- 

 bilicus. Length, 5 mill. 



Holdfast Bay, So. Australia. 



The pertinence of this species to Amauropsis is very ques- 

 tionable. 



Subgenus Amaurella, A. Ad., 1867. 



The species, three in number, are unfigured : N. Japoriica, 



N. glahrata and N. semistriata, A. Ad. 



Japan. 



Unfigured and Undetermined Species. 



N. RUSSA (Arctic Ocean) and N. severa (Japan), of Gould. 



N. PniLiPPiNENSis (Philippines), N. atrypa (W. of Gape York, 

 S. W. of Papua), N. pseustes (Fiji Islands), N. suturalis 

 (Kerguelen Isl.),'N. radiata (Bermuda), 'N. amphiala ( E. N. 

 E.from N. Zealand), N. leptalea ( West Indies). N. xan'tiia 



