Baker—Molluscan Fauna of Tomahawk Lake , Wisconsin . 211 
Station XIII. (Figures 7, 8, 9.) 
Swamp at head of thoroughfare between Tomahawk and Lit¬ 
tle Tomahawk Lake. The swamp is of large size (Figure 7) ex¬ 
tending in a westerly direction well into the wooded portion of 
the country. A deep creek meanders through the swamp, but 
outside of this the water is very shallow in many places, scarcely 
covering the boggy bottom, which in places extends above the 
water, forming miniature islands of soft, starchy consistency. 
The deep water of the thoroughfare is inhabited by a pond- 
lily society consisting of Castalia odoraia, Nymphcea advena 
and Potamogeton natans. The swampy portion is thickly cov¬ 
ered with a Typha latifolia society with a few Scirpus lacustris. 
The shores rise abruptly from the swamp and are thickly cloth¬ 
ed with a spruce, hemlock, cedar and birch forest. As in all of 
the bays of Tomahawk Lake, this swamp is filled, near the shore, 
with the dead trunks of trees killed by the rising of the water. 
This station was one of the best for molluscan life, the eight 
species tabulated, living here in large numbers. 
Substation 1. 
Shore 1 , Floating Logs or Boggy Islands Hear the Shore. 
Planorbis binneyi. 
Lymnoea lanceata. 
Lymncea megasoma. 
Lymncea stagnalis appressa. 
Bulimnea megasoma was found on the boggy islands and on 
logs near the shore, one or two specimens only being seen in one 
place, the species not being gregarious, apparently. 
Substation 2. 
Castalia-Nymphoea Plant Society. 
Amnicola cincirmatiensis. 
Physa ancillaria warreniana. 
Planorbis campanulatus. 
Lymncea columella. 
