LIMN^A. 481- 



twice as large, and it has no conspicuous umbilicus. L. ^'s- "32. 



caperata is similar in its form, and its small, oval aperture, 



but is at once recognized by the regular revolving, hispid 



lines. Fig. 732 represents a specimen of the last from Mas- l. caper. 



sachusetts. 



[Referred \)\ me to L. caperata in " Land and Fresh- Water 

 Shells," ii. oG*. — W. G. 13. 



Limnsea pallida. 



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

 vex ; aperture sub-ovate, five ninths of the length of the shell ; columella fold dis- 

 tinct ; umbilicus rather small. 



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

 iii. 324, pi. 3, fig. 13 (1840) ; Shells of Vermont, 153 (1842). — Haldeman, Mon. 45, 

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

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



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

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

 growth, without revolving striae ; 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 ]3ro- L.pniu. 

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

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

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

 labrum not thicl^ened 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 Middlebury 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 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. Tlie figure represents 

 the columella of the acuta as intruding upon the aperture, which is 

 not the case with this shell. {Adams.) 

 31 



