[ 228 AMERICAN JOURNAL 



LIMN^A. 



1. LiMNiEA EowELLii, Try on. — t. 23, f. 1. 



Description. — Shell elongate, narrow, consisting of six rather 

 obliquely revolving whorls ; spire somewhat attenuately length- 

 ened ; apex acute ; suture not much impressed ; aperture not 

 half the length of the shell, oblique ; columella with a distinct 

 fold, turned to the left below, and appressed to the body the 

 whole distance ; surface rather smooth and polished; texture 

 fragile. 



Dimensions. — Length 25 millimetres,diameter 10 mill.; length 

 of aperture 11 mill., width 5 mill. 



Habitat — Sau Francisco, California. Rev. J. Rowell. 



My Cabinet. Cabinet of Mr. Rowell. 



Observations. — This species resembles L. attenuata, Say, and 

 L. reflexa, Say, more than any others. The first is much 

 narrower, and the whorls are not so convex, while the latter is 

 more elongate, more convex, and the aperture is narrower and 

 turned back. 



It is a very pleasing species, very graceful and modest in 

 appearance. 



2. LiMN^A ZEBRA, Tryon. — t. 23, f. 4. 



DescrijJtion. — Shell long, narrow, composed of 5|- slightly 

 convex, very oblique volutions; suture well marked; aperture 

 small, narrow, ovate, oblique ; columella slightly folded, curving 

 to the left ; labium appressed to the body whorl for its entire 

 length; umbilicus covered; labrum margined within; color 

 light brown, variegated by double longitudinal, somewhat 

 oblique white lines. 



Dimensions. — Length 27 millimetres, diameter 8 mill.; length 

 of aperture 11 mill., width, 4| mill. 



Habitat. — Minnesota. J. H. Slack, M. D. 

 Michigan, Prof Manly Miles, 

 Milwaukee, Wis. Hon. I. A. Lapham. 



My Cabinet. Cabinet of Mr. Lapham. Michigan State 

 Collection. 



Observations. — A very beautiful species. Prof. Haldeman 

 has figured it* first, (PI. 7, f. 2, 6,) as L. umbrosa, and after- 

 wards, (PI, 8, f, 1, 2,) as L. reflexa. It is a longer, narrower 

 species than the first, and is very near to the last, but differs 

 in the appressed columellar lip, covered umbilicus, and in its 

 singular ornamentation. The specific characters appear to be 



* "Mono». of the Limniades." 



