LIMN^A.— Plate III. 



short, rather obtuse, whorls small, reddish-brown, 

 the last large, ovate ; apertuxe middle-sized, ovate, 

 columellar fold rather tortuous. 



Say. Journ. Acad. Soi. Phil., vol. ii. p. 123. 



Limncea desidiosa, Say ? 



ffab. N.W. Territory, United States. 



Species 19. (Fig. a, b, Mus. Brit.) 



LiJiN.EA GRACILIS. Lim. testd angustissimd, altemmtd, 

 pallide conieo, sjnrd elongatd, aculeatd, anfractihus 

 quatuor, atlenuatis, suhpyramidatis, vltimo paulu 

 expanso ; aijerturd brevi, angusto, labio externa 

 suprd deflexo, columelld recUusculd. 



The slender Limx^ea. Shell very narrow, attenuated, 

 pale horn, spire long, aculeated, whorls four, 

 attenuated, subpyramidal, the last a little ex- 

 panded ; aperture short, narrow, outer lip bent 

 downwards above, columella rather straight. 



Sat (Acella). Haldeman, Mon., pi. 13, f. 21. 



Hab. Vermont. 



This species is so singular in form that it has been 



thought worth while to separate it generically under 

 the name of Acella. 



Species 20. (Mus. Brit.) 



Ldin^a appressa. Lim. testd subpyriformi, opacd, 

 corned, gracili, spird elongatd, pyramidatd, 

 aitenuatd, anfractibus laterallter appresds, ultimo 

 expanso, antice stdjacumi7iato ; aperiurd hrevlas- 

 culd. 



TuE ATPRESSED LiJlN^EA. Shell subpyriform, opaque, 

 horny, slender, spire elongated, pyramidal, at- 

 tenuated, whorls compressed at the sides, the last 

 expanded, subacuminated anteriorly; aperture 

 rather short 



Say. •Journ. Am. Nat. Sci. PhiJ., vol. ii. p. 1C8. 



Hob. Vermont. 



More slender than the European L. slagnalis, and 

 having the whorls pressed together at the sides, 

 without the angular form of that well-known species 



