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. 



