46 LIMNEA PALLIDA. 



SYNONYMS AND REFERENCES. 



L. pallida, Adams. Bost. Journ. Nat. Hist., vol. iii. p. 

 324, pi. 3, fig. 13.— Am. Journ. Sci., vol. 39, p. 374. 



DESCRIPTION. 



Shell conical, smooth, imperforate, thin in 

 texture, and fragile; with 5 or 6 slightly convex 

 whirls, and a shallow well-defined suture: spire 

 as long the aperture, or longer, with a subacute 

 apex: aperture ovate, symmetrical; columellar 

 fold well marked, and remarkably constant: 

 lines of accretion very fine, and undeviating; 

 crossed by minute spiral corrugations. 



Color varying from pale ochraceous to 

 white; apex often tinged with brown. 



Geographical Distribution. " Habitat at 

 Shoreham, Vermont, on shores of Lake Cham- 

 plain, clinging to rocks and stones." — Adams. 



OBSERVATIONS. 



The shell of this species presents no varie- 

 ties. It is easily recognised by its regularly 

 conical and beautiful form, pale uniform tint, 

 and columellar fold. Its affinities are L. desi- 

 diosa and L. humilis. 



