LIMN^A. 



61 



fold of the columella distinct, but not very large ; umbilicus ratlier small. 

 Length .48 inch ; breadth .22 inch. Cabinets of the Boston Soc. N. H. ; 

 of Middlebury College ; of Dr. A. A. Gould, of Boston ; of J. G. Anthony, 

 of Cincinnati; and my own. 



Habitat and station. This species was found in considerable numbers at 

 Storeham, Vt., on the shore of Lake Champlain, clinging to rocks and 

 stones. 



This species most resembles L. acuta, Lea, of which, however, I have 

 not seen a specimen. That shell, in a very brief description, is said to be 

 delicate, smooth, and dark-brown, while this is rather strong, striate, and 

 of a very pale horn color, in living specimens, like the weathered shells 

 of kindred species. The figure represents the columella of the acuta as 

 intruding upon the aperture, which is not the case with this shell. 

 (^Adams.) 



Limnaea pallida, Adams, Am. Journ. fie. [i], XXXIX, 374 (1840) ; Bost. 

 Journ. Nat. Hist. Ill, 324, pi. iii, f. 13 (1840) ; Shells of Vermont, 

 153 (1842).— Haldeman, Mon. 45, pi. xiii, f. 11-13 (1842).— DeKay, 

 N. Y. MolL 69, pL iv, f. 67 (1843). 



Fouud from New England to Michigan, and apparently in 

 California. Mr. Lea quotes it from San Antonio Arroya. 



Fig. 95 is a fac-simile of one of Adams's figures, accompanying 

 his description, which is also copied above. 



It must not be confounded with L. pallida, Guer. 



Liiiniiaea 'bulimoides, Lea. — Shell ovately-conical, rather thin, 

 smooth, shining, diaphanous, brownish-yellow, slightly perforate ; spire 

 rather short ; sutures small, whirls five, slightly convex, aper- 

 ture ovate. 



Oregon: Prof. Nuttall. My cabinet, and cabinel of Mr. 

 Nuttall. Diam. .22, length .38 inch. 



Among the shells taken by Prof. Nuttall, in his journey over 

 the Rocky Mountains, was this small species, the aperture of 

 which is formed very much like a Bulimus. The deposit of the 

 columella is wide, and nearly covers the perforation, which con- 

 sequently is very small. The aperture is nearly half the length 

 of the shell, and the fold obsolete. Several of the specimens, although 

 the substance of the shell is thin, have the apex eroded, some of the 

 superior whirls being entirely gone. I have not observed this to be the 

 case in other Limnwas. (^Lea.) 



