LIMNEA FERRUGINEA. 49 



dency to become obtuse, as in figure 16; never- 

 theless, the evidence is not sufficient to induce 

 me to believe the two to be distinct; and I 

 consequently leave the question open to future 

 observation. 



LIMNEA FERRUGINEA, Raid. 



Plate 13.— Figs. 19, 20. 



L. testa parva, ovata, imperforate.: anfractibus 4 con- 

 vexis: sutura impressa: apertura ovata: plica columellari 

 conspicua. 



SYNONYMS AND REFERENCES. 

 L. ferruginea, Hald. This work, March 13th, 1840. 



DESCRIPTION. 



Shell ovate-conic, thin in texture and diapha- 

 nous, with 4 convex whirls, distinct suture, and 

 well marked columellar fold: aperture oval, 

 about as long as the spire: labium appressed: 

 ferruginous. 



Geographical Distribution. Hab. Oregon, 

 Mr. Nuttall. 



K 7 



