208 Wisconsin Academy of Sciences, Arts, and Letters. 
Station VI. 
k ' ; . 
Sand Bar and Exposed Lake Shore Worth of Station V. 
This habitat is occupied principally by Lymnoea emar¬ 
ginata wisconsinensis which thickly covers the sand and the rocks-' 
of the shore. 
MOLLUSCA COLLECTED. 
Lymnoea emarginata wisconsinensis. 
Planorbis campanulatus. 
Planorbis campanulatus rudentis. 
Physa ancillaria warreniana. 
Station VII. (Figure 6.) 
Exposed shore north side of lake, three miles west of Sanders 9 ' 
Resort (old logging camp Wo. 7). The beach is sandy, shallow 
and slopes gradually into deep water. The land back of the 
beach is elevated three feet or more above the beach and forms a 
flat plain for a considerable distance. Several species of mol- 
lusks live on this exposed beach, their dead shells with other 
debris forming a distinct line at high water mark. Lymnoea 
emarginata wisconsinensis is here the most abundant mollusk r 
and its shell shows all degrees of variation between elongated 
and globose. Lymnoea stagnalis lilliance also shows much var¬ 
iation in the form of the shell. Amnicola consisted only of 
dead, bleached shells which had doubtless been washed from a 
nearby habitat. 
MOLLUSCA COLLECTED. 
Campeloma decisum (living and dead). 
Amnicola cincinnatiensis (dead). 
Physa ancillaria warreniana (dead). 
Planorbis campanulatus (living and dead). 
Planorbis campanulatus rudentis (living and dead). 
Planorbis bicarinatus striatus (living and dead). 
Lymnoea stagnalis lilliance (living and dead). 
Lymncea emarginata wisconsinensis (living and dead) 
