THE NATURAL HISTORY SURVEY. 279 
Habitat: Yound plentifully in creeks, ponds, lakes and 
rivers, attached to pieces of floating wood, submerged vegeta- 
tion, stones, etc. Also found attached to floating garbage, 
such as decaying apples, vegetables, etc. 
Remarks: This is one of our most common species, and, 
excepting L. stagnalis, is the finest and largest Limnca we have. 
It is always characterized bya long and attenuated spire which 
is generally twice as longastheaperture. In palustris the spire 
and aperture are nearly equal, and the shell is wider in propor- 
V L4¥ 1 A+ eh 
37 
Fie. 91. 
Radula of LIMN#@A REFLEXA Say. (Original.) c, central tooth; 1, 
first lateral; 11, 14, intermediate teeth; 18, 24, 29, 87, 39, marginals. 
Mey 
tion to its length-than in veffexa, and the latter is very rarely 
malleated. There is great variation in the attenuation of the 
spire, which the figures well illustrate. The lip is sometimes 
continuous and entirely separated from the body whorl, and 
the whorls are swollen and separated by a deep suture, as 
shown on plate xxxi, Fig.1. This is intermediate between the 
typical form and variety scalars. 
The animal is generally rather sluggish in movement, but 
sometimes moves with considerable rapidity, especially when 
feeding. The species is as widely distributed in the present 
area as palustris. 
Dr. Howard N. Lyon has raised this species from the egg 
