50 LIMNEA GRACILIS. 



OBSERVATIONS. 



Closely allied to L. humilis, but may be dis- 

 tinguished by the want of an umbilic, and the 

 well defined fold on the columella. 



LIMNEA GRACILIS, Jay. 



PLATE 13. FIG. 21. 



L. testa pergracili pallida, preelonga; spira producta: 

 anfractibus 4 6 planulatis. 



SYNONYMS AND REFERENCES. 

 L. GRACILIS, JAY'S Catalogue, pi. 1, fig. 10. 



DESCRIPTION. 



SHELL very slender, with from 4 to 6 flat, 

 and very obliquely revolving whirls: suture 

 distinct, lines of accretion fine; labium unat- 

 tached, without fold: aperture ovate, spread 

 out, and rounded at both ends. 



COLOR nearly white. 



