200 THE CHICAGO ACADEMY OF SCIENCES. 
ella and bicuspid lateral teeth; Simpsonia, with tricuspid lateral teeth ; 
and Stagnicola, with a strong spirally lined shell, a plicate columella 
and a characteristic radula and genitalia. 
The name Galba was given by Schrank to a species of Lymnea 
which has been referred to both the Buccinum truncatulum and the 
Buccinum palustre of Miller. Dr. Dall is probably right in selecting 
truncatulum as the type, the description of both shell and animal agree- 
ing very closely with truncatula. The name Stagnicola would be pre- 
{erable for the genus name were it not that Galba has priority and 
must be retained for the genus; Stagnicola, however, may be used as 
a subgenus for the large shells with impressed spiral lines and plicate 
columella. 
The name Limnophysa has been almost universally used for the 
large, palustris-like Lymnzeas, but this is an absolute synonym of Stag- 
nicola, which was published three years earlier. Leptolimnea may be 
retained for those shells with a cylindrical shell, numerous whorls, 
and a small aperture. The anatomy of this group is unknown. 
Galba includes the large majority of the species of our Lymneeids. 
The shells are generally long and graceful, and some one of the species 
is invariably a characteristic member of the fauna of almost any local- 
ity in North America. They occur in almost countless thousands in 
some localities. 
Subgenus GALBA Schrank, 1803. 
1803. Galba Scuranx, Fauna Boica, III, pt. 2, pp. 262, 285. (Sole example 
Buccinum truncatulum Miller, vide Dall). 
1865. Limnophysa BINNEY (part), L. and F. W. Sh. N. A., II, p. 38. 
1870. Limnophysa Dati (part), Ann. N. Y. Lyc. N. H., IX, p. 349. 
1870. Limnophysa Cooper (part), Proc. Cal. Acad., Ser. i, IV, p. 96. 
1872. Limnophysa Tryon (part), Con. Hald. Mon., p. 87 (61). 
1872. Limne@a Tryon (part), Con. Hald. Mon., p. 87 (61). 
1876. Limnophysa MEEK (part), Rep. U. S. Geol. Surv. Terr., IX, p. 533. 
1884. Limnophysa Tryon (part), S. and S. Conch., III, p. 101. 
1885. Fossaria WESTERLUND, Fauna Pal. Reg., V, p. 49. (CL. truncatula Miller). 
1902. Fossaria WESTERLUND, Acta Soc. Sci. Slav. Merid., CLI, p. 118. 
1905. Galba Dati, Alaska Mollusks, p. 64. 
1908. Galba Baxer, Science, N. S., XXVII, p. 943. 
Suett: Generally small, turreted, surface usually without spiral 
lines; axis not twisted, forming a series of smooth, almost round pil- 
lars from apex to umbilicus; columella without a plait; inner lip 
usually forming a wide, smooth, spreading callus, which is turned back 
against the parietal wall; umbilicus a small chink or roundly open; 
outer lip thin, sharp, rarely forming, when adult, an internal rib just 
within the edge (pl. XVIII, fig. 2). 
