LIMNEA PALLIDA. 45 



not crossed by spiral striae: aperture as long as 

 the spire, level, sub-round, and slightly pro- 

 duced posteriorly: labium very closely appress- 

 ed, except anteriorly, where it forms a small 

 umbilic; columella without fold: spire gene- 

 rally much eroded, with the apex frequently 

 truncated. 



Color pale ochraceous, sometimes marked 

 with reddish varicose bands. 



Geographical Distribution. Brought from 

 Oregon by Mr. Nuttall. 



OBSERVATIONS. 



Small specimens resemble L. humilis; but 

 the texture is more dense, the appearance more 

 robust, the surface smoother, and the color 

 more decidedly ochraceous. 



LIMNEA PALLIDA, Adams. 



Plate 13.— Figs. 11—13. 



L. testa conica, fragili, simplice, pallida: anfractibus 

 5 — 6 convexis: plica columellari conspicua. 



