312 THE CHICAGO ACADEMY OF SCIENCES. 
was drained ages ago by the cutting down of the barrier.” (Hender- 
son, Colorado. ) 
In a still, swampy pool, protected from the waves of Lake Huron. 
(Nason, Alpena, Mich.) 
“Taken from a pond near Bitter Root River. Quite abundant, 
several hundred specimens taken. Also taken in abundance in standing 
and quiet waters in the creeks on Flathead Indian reservation. At 
the upper end of Flathead Lake there is a great deal of marshy country 
tributary to the lake and to Flathead River. In the lowland bordering 
on the lake, which had been overflowed and later dried off, large 
quantities of dead shells were observed. Indeed, the shells were so 
abundant one could not walk without mashing large numbers. In 
still other places the shells were yet alive in the sloughs, in great abun- 
dance. Along the Bitter Root River the shells were living in the same 
waters with Aplexa hypnorum.” (Elrod, Montana. ) 
“A few days ago, while collecting fresh-water shells in the dry 
bed of a pond near Alum Rock Park, San José, the author found 
several live specimens of a form of Lymnea palustris (Miller) lying 
on the dry mud surface with the aperture sealed down by a thick dried 
mucus and withdrawn into their shells half a whorl. The pond usu- 
ally contains water at least half the year, but on account of the dry 
spring has contained none since April 1st at least. The bed is thinly 
covered with tall tulas, so that the shells were not in the direct rays 
of the sun. This form is the only one which occurs in the lake, and 
dead shells up to barely mature are abundant, and some larger.” 
(Hannibal, California.) 
“Young, hatched in August, in a small aquarium, were fully grown 
by midwinter.” (Sterki, Ohio.) 
Quinn River crossing, Humboldt County, Nevada, altitude 4100 
feet. In pools, Yellowstone Park. (Berry.) 
REMARKS: Palustris is one of the commonest and most variable 
of the Lymneas, being equaled in this respect only by Galba obrussa. 
The large, more or less corpulent shell, with its coarse, generally mal- 
leated sculpture and heavy columella plait, will easily distinguish it 
from related species. The whorls in typical palustris are always well 
rounded, especially the body whorl, which may be quite robust. The 
aperture and spire are generally equal in length and the whorls are 
much wider than high, a character which will help to separate the 
narrow forms from reflexa and elodes. The principal variation is in 
the form of the spire, which in some specimens is long and narrow 
while in others it is short and corpulent. This variation does not seem 
