47 



LIMNEA VITREA, Hold. 



Plate 13.— Figs. 14, 15. 



L. testa ovata, perforata, lata, tenuissima, diaphana: 

 anfractibus 4 convexis. 



SYNONYMS AND REFERENCES. 

 L. vitrea, Hald. This work, October 5th, 1841. 



DESCRIPTION. 



Shell ovate, extremely thin and delicate: 

 surface smooth and polished: lines of growth 

 very fine: aperture ample: the labium presents 

 a well marked fold, and is not appressed ante- 

 riorly: spire short. 



Geographical Distribution. Ohio? Mis- 

 souri? 



Foreign Analogue. L. tenuis, Bronn. 



OBSERVATIONS. 



This species presents us with a shell which 

 is probably thinner in texture than that of any 

 other which we have. For the specimens 

 figured, I am indebted to Mr. G. B. Emerson, 

 President of the Boston Society of Natural 

 History. 



