98 College of Forestry 
V. Water Lily-Burreed-Bulrush Type. 
Station XX XI." This habitat combines characteristics of 
both the last (IV) and the next (VI) habitats. It is pro- 
tected from the violence of the waves by the heavy outer 
zones of Water Willow which serve as an effective barrier 
against rough water. For this reason the delicate shelled 
Acella is able to live here. The submerged vegetation of the 
next type is absent and hence some species not found in that 
association are able to live here. The bottom is sandy silt, 
rather soft and the water is from 18 to 30 inches deep. The 
vegetation embraces : 
(Fig. 24.) 
sur-reed (Sparganium eurycar-  Smith’s Bulrush (Scirpus smithit). 
pum). Pickerel-weed  (Pontederia  cor- 
Broad-leaved -Arrow-head  (Sagit- data). 
taria latifolia). Sweet-scented Water Lily (Cas- 
American Bulrush (Scirpus ameri- 
canus). 
talia ordorata). 
Cow Lily (Nymphaea advena). 
Animal life is abundant on the bottom and particularly on 
the submerged portions of the vegetation. 
ANIMAL LIFE. 
MOLLUSCA. 
Ancylus fuscus, common. 
Acella haldemani, common. 
Planorbis trivolvis, common. 
Planorbis campanulatus, common. 
Lymnea stagnalis lillianew, com- Physa ancillaria warreniana, rare. 
mon. Amnicola lustrica, rare. 
Galba catascopium, rare. Bythinia tentaculata, not common. 
INSECTA. 
Caddis-fly larve (Platycentropus Caddis-fly larve (Limnephilid), 
maculipennis), rare. rare. 
VI. Water Lily-Chara-Pondweed Type. 
(Figs. 6, 8.) 
Stations I,’ III,t VI, X. This type of habitat is always 
found in a partly enclosed bay where there is ample protection 
from the rough waters of the lake. 
The water is from 2 to 
5 feet in depth and the bottom is sandy or silty. The vegeta- 
tion is abundant, comprising a large number of species as 
noted below: 
