LYMNZIDZ OF NORTH AMERICA. ; 311 
QueEBEC: Saxicava Sand, Packenham Mills, 266 feet above Lake St. Peter, 
St. Lawrence Valley (Dawson. Probably drifted into sea by fresh-water 
streams). 
Ecotocy: Found plentifully in bodies of water of greater or less 
size, on floating sticks and submerged vegetation, on stones and on 
the muddy bottom. Inhabits both clear and stagnant water, but pre- 
fers a habitat in which the water is not in motion. Seldom found 
out of the water, as is the case with the smaller species of the sub- 
genus Galba. The more distinctly malleated forms inhabit stagnant 
pools where the bottom is muddy, with more or less decaying vege- 
tation present. The food of palustris is made up of both animal and 
vegetable matter, the species being literally vegetiferous, scavengiferous 
and carnivorous. The writer has noted it feeding upon the dead car- 
casses of dogs, cats, rats, etc., upon rotting vegetables and decaying 
fruit. Dr. Sterki (Nautilus V, p. 94) has seen it in the act of eating 
a living leech. The animal of palustris is very rapid in movement. 
When crawling, the shell is frequently moved rapidly from side to 
side, and is carried at all conceivable angles. It is a very rapid feeder 
and will soon clear up the sides of an aquarium. Like other species 
of the genus, palustris has the habit of rising very suddenly from the 
bottom to the top of the water, where it will then float, shell downward. 
( Baker.) 
- “In small brook on farm near Caribou Village, Maine.” (Ny- 
lander. ) 
“L. palustris I have found only in lakes except some unusually 
large specimens from a small ditch connecting two lakes on the plains 
near Fort Collins, and found none in either of the lakes, but it was 
when the lakes were full, at which time it is usually harder to find 
Mollusca along the shores of our fluctuating lakes. In the valleys I 
have found them in lakes containing some vegetation but not choked 
therewith except around the inlets. In the mountains I have found 
them only in sedge-choked, very shallow lakes which nearly dry up 
in the late summer. At Lake George, altitude about 8000 feet, I found 
it in very shallow water with fine mud bottom at the head of the lake, 
and in a seepage pool with fine mud bottom just below the lake. This 
lake is purely artificial, formed by throwing a dam across the South 
Platte at a point where the canyon widens out into a broad valley, 
so I presume these shells may have been brought down the river from 
some lake nearer its source. There is no vegetation in either the lake 
or the pool. It is interesting to note that the Lymnzas occupied the 
same region in Tertiary time (L. sieverti, L. scudderi, Ckll., Bull. Am. 
Mus. Nat. Hist., Vol. 22, p. 461), but the lake in which they lived 
