' LIMNJIA. 481 



twice as lai-gc, and it lias no conspicuous unihilicus, L. ^'b- "32- 



capcrata is similar in its form, and its small, oval aperture, P) 



but is at once recognized by the regular revolving, hispid ^ 



lines. Fiii". 782 renresents a sijecimen ot" the last from Mas- l. caper. 

 sachusetts. 



[Referred by me to L. capcrata in " Land and Fresh- Water 

 Shells," ii. 56". — W. G. B. 



Limnsea pallida. 



Shell ovate-fusiform, pale horn color; whorls five and a half, moderately con- 

 vex ; aperture sub-ovate, five ninths ol' the length of the shell; coluuR'lla fold dis- 

 tinct; umljilicus rather small. 



Limncca pallida, Adams, Am. Journ. Sc. [i], xxxix. .374 (1840) ; Bost. Journ. Nat. Hist, 

 ill. 324, pi. 3, fig. 13 (1840) ; Shells of Vernaont, 153 (1842). — Haldeman, Mon. 4.5, 

 pi. 13, figs. 11-13 (1842).— De Kay, N. Y. Moll. 69, pi. 4, fig. 67 (1843). — W. 

 G. BiNNEY, Smith. Inst. L. and Fr. W. Shells, ii. 60, tig. 95 (1865). 



Shell moderately elongate, ovate-fusiform, very pale horn color, 

 semi-transparent, not very thin, with fine irregular stride of 

 growth, without revolving stria3 ; whorls about five and a 

 half, moderately convex ; suture well-impressed ; spire four 

 ninths of the length of the shell, acutely conic, its opposite 

 sides containing an angle of about forty-five degrees, sub- 

 acute at tip ; body whorl not much enlarged, somewhat pro- 

 duced below ; aperture five ninths of the length of the shell, 

 sub-ovate acute above, angle of its plane Avith the axis of the shell 

 about fifteen degrees, of its length with the axis about ten degrees ; 

 labrum not thickened internally ; fold of the columella distinct, but 

 not very large ; umbilicus rather small. Length, forty-eight hun- 

 dredths of an inch ; breadth, twenty-two hundredths of an inch. 

 Cabinets of the Boston Soc. N. H. ; of Middleluiry College ; of Dr. 

 A. A. Gould, of Boston; of J. G. Anthony, of Cincinnati ; and my 

 own. 



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 lu-ief 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.) 

 31 



