NEW FRESH WATER AND LAND SHELLS. Il 
LYMN@A COARCTATA. 
Testa fusiformi, tenuissimd, obsolete striata, diaphand, corned, imperforata; spird brevi, mucronata; suturis leviter 
impressis; anfractibus quaternis, subplanulatis ; apertura grandt, ovata. 
Shell fusiform, very thin, obsoletely striate, diaphanous, horn colour, imperforate; spire short, pointed; sutures slightly 
impressed; whorls four, rather flattened; aperture large, ovate. 
Hab. Newport, Rhode Island. Col. Totten, United States Army. My Cabinet, and Cabinet of 
Col. Totten. Diam. .30, Length .55 of an inch. 
Remarks.—This is one of the most delicate and fragile of the genus Lymnea, which I 
have seen. It isallied to Mr. Say’s columella, but may at once be distinguished by the com- 
pression of the superior part of the body whorl, which causes an acute angle in the supe- 
rior part of the aperture. Under a rather powerful lens, some of the specimens may be 
perceived to have very minute revolving strive. The aperture is two-thirds the length of 
the shell, and is inflated at the inferior part. The fold of the columella is delicate and 
incurved. 
LYMNZA CASTA. 
Testd subfusiformi, subcrassd, crebrd striatd, luted, perforata ; spird subelevata, acuminata; suturis impressis; an- 
fractibus senis, convexis; aperturd grandi, ovata. 
Shell subfusiform, rather thick, closely striate, yellow; perforate; spire rather elevated, accuminate; sutures impressed; 
whorls six, convex; aperture large, ovate. 
Hab. Poland, Ohio. Dr, Kirtland. My Cabinet, and Cabinets of Dr. Kirtland and 1T.G. Lea. 
Diam. .30, Length .58 of an inch. 
Remarks.—The columella of this species is remarkably straight, and being reflected 
causes the lower part of the aperture to be slightly effuse. The last whorl is wrinkled. 
The aperture is more than half the length of the shell. It is allied to L. decidiosus, (Say,) 
but is a smaller species, has the spire more exserted, and a less curved fold. The perfo- 
ration is very small. Dr. Kirtland kindly sent me many specimens several years since. 
LYMN&A PARVA. 
Testa subturritd, tenui, levi, diaphand, corned, subperforata; spird elevata; suturis impressis ; anfractibus quinis, 
convexis; apertura ellipticd. 
Shell subturrited, thin, smooth, diaphanous, horn colour, subperforate ; spire elevated; sutures impressed; whorls five, 
convex; aperture elliptical. 
Hab. Cincinnati, Ohio. T. G. Lea. My Cabinet, and Cabinet of T. G. Lea, Diam. .12, Length 
.22 of an inch. 
Remarks.—This is the smallest species which has come under my notice. In general 
form it resembles L. curta, herein described. It is rather less inflated, has a longer aper- 
ture, and is more diminutive. The perforation, too, is smaller, and the columella more 
curved. The two specimens before me have the superior whorls black from the deposite 
of the oxide of iron. The aperture is about half the length of the shell. 
LyMN&A CURTA. 
Testd subturritd, subtenui, nitidd, subdiaphand, luted, perforata; spird elevatd; suturis impressts; 
Convewis; aperturd parvd, ellipticd. 
Shell subturrited, rather thin, shining, subdiaphanous, yellow, perforate; 
convex; aperture small, elliptical. 
anfractibus senis, 
spire elevated; sutures impressed ; whorls six, 
