218 Wisconsin Academy of Sciences, Arts, and Letters. 
MOLLUSCA COLLECTED. 
Lampsilis luti&ola. 
Lampsilis ventricosa. 
Lampsilis ligamentina. 
Strophitus edentulus. 
Anodonta grandis footiana. 
Anodonta marginata. 
Anodonta implicata. 
Symphynota costata. 
Symphynota comprcssa. 
Campeloma decisum. 
Station XXIII. 
Mucky slough iu marsh near mouth of Gilmore Creek. The 
Water is shallow (eight inches to a foot or more) and the muddy 
bottom, which is composed of soft, impalpable, black mud formed 
from vegetable decomposition, is from two to six feet in depth. 
The pool is bordered by Iris, Typha and swamp grass and is 
partly filled with old logs. 
This slough is the best habitat for Bulimnea megasoma which 
has come under the writer’s observation, the specimens being 
numerous as well as large and of fine color. The individuals 
were observed attached to logs and other floating debris, as well 
as on the soft mucky bottom. Plarvorbis birineyi and Bulimnea 
were the only mollusks present. 
