38 



LAND AND FRESH-WATER SHELLS OF N. A. [PART IL 



Limnaea meijasoma, Haldeman, Mon. 13, pi. iii, f. 1-3 (1841). — Adams, 



Shells of Vermont ; Thorns. Vt. 153, excl. fig., 



Fig. 47. pamphlet, p. 3 (1842).— DeKay, N. Y. aioU. 



70, pi. iv, f. 70 (1843). 



Bulimnea megasoma, Cheku, Man. de Conch. II, 



480, f. 3543. 



This is a northern species, rang^ing from 

 Lake Champlaiu to Michigan. The shell, 

 by which it is commonly represented in col- 

 lections, corresponds perfectly with Mr. Say's 

 types in the Philadelphia Academy. His de- 

 scription and figure are copied above (Fig. 46). 



Prof. Adams' figure does not represent 



Subgenus LIMNOPHYSA, Fitz. 



Shell ovate-oblong ; spire conic, about as long as the aperture, 

 whirls rounded ; outer lip not spreading. 



The date of publication of Limnophijsa is 1833 — Limnaea 

 pahidris being the type. I find this prior to all other names 

 for the section. Stagnicola, Leach, was first described in 1840, 

 in Gray's edition of Turton, Leach's work was not then printed, 

 and the edition of Turton bearing date 1831 gives no description, 

 merely referring in the synonymy of several species to Leach's 

 manuscript. Galha, Schrank, antedates Limnophysa, but is 

 placed in the synonymy by Herrmannsen, no doubt for valid 

 reasons. 



Liiniiiaea reflexa, Say. — Shell fragile,, very much elongated, nar- 

 row, honey-yellow, tinctured with brownish, translucent, slightly reflected 

 from the middle; volutions six, oblique, wrinkled transversely; spire 

 more than one and a half times the length of the aperture, acute, two or 

 three terminal whirls vitreous, body whirl very much dilated ; aperture 

 rather narrow ; labrum with a pale margin, and dusky red or blackish 

 sub-margin. 



