LIMN^A. 



C3 



Fig. 112, drawn from his type, which he sent me for this purpose. 

 No. 9126 of the collection was presented by Prof. Agassiz, from 

 among the original lot collected by him. 



Sdegknus ACELLA, Hald. 



Shell very slender, spire attenuated, whirls flattened, oblique ; 

 aperture produced, expanded, without fold. 



Fie. 113. 



Liiinnaea gracilis, Jay. — Shell very slender, with from four to six 

 flat and very obliquely revolving whirls ; suture distinct ; lines of accretion 

 fine ; labium unattached, without fold ; aperture ovate, spread 

 out, and rounded at both ends. Color nearly white. 



This is the most slender species of Limnaea known, and was 

 discov.ered by Prof. Emmons in Lake Champlain. 



Prof. Adams mentions a specimen in his cabinet one inch in 

 length, and in the convexity of the penult whirl only .15 inch 

 diameter. The last whirl is scarcely broader, except across 

 the lips, both of which are expanded. Although nearly seven 

 times longer than the average breadth, it has only four and a 

 half whirls. (^Haldeman.) 



Limnasa gracilis. Jay, Cat. 3d ed. 112, pi. i, f. 10, 11 (1839).«-Adasi.«, 

 Shells of .Vermont, Thom. Vt. 153, pamphlet, 3 (1842).— DeKay, 

 N. Y. Moll. 70, pi. iv, f. 73 (1843).— Haldeman, Mon. 50, pi. x'iii, f. 

 21 (1842). 



Acella gracilis, Chenu, Man. de Conch. II, 480, f. 3545. 



The species has also been quoted from Wisconsin, Fig. 114. 

 Ohio, and Michigan. Fig. 113 was photographed from 

 nature on to the wood. The following are Jay's de- 

 scription and figure : — 



Essex County, N. Y. I am indebted to Prof. Benedict, of 

 Burlington, Vt., for two specimens of this very slender and Limncea 

 fragile Limnsea. (^Jay.) gracilia. 



852-t 

 9127 

 9068 



No.ofSp.l 



Locality. 



From whom received. 



10 



1 



20+ 



Schuyler's Lake, N. Y. 



New York. 



Otsego County, N. Y. 



Dr. J. Lewis. 



Cabinet series 



