44 College of Forestry 
Sweet-scented Water Lily. (Cas- Cow Lily (Nymphea advena). 
talia odorata). Floating Pond-weed (Potamogeton 
natans). 
SUBMERGED VEGETATION. 
Clasping-leaved Pond-weed (Po- Water Milfoil (Myriophyllum spi- 
tamogeton perfoliatus). catunv) . 
Water Weed (Hlodea canadensis). Water Celery (Vallisneria  spi- 
Hornwort (Ceratophyllum demer- ralis) . 
sum). 
ANIMAL LIFE. 
MOLLUSCA. 
Acella haldemani, on leaves of  Physa ancillaria warreniana, on 
water lily. leaves of water lily. 
Pseudosuccinea columella, on Planorbis campanulatus, on leaves 
leaves of water lily. of water lily. 
Habitat 2. Cat-tail shore facing lake (Fig 9), Field Nos. 
252, 253. 
There are three distinct cat-tail associations, each separated 
by a rounded point free from shore vegetation. One of these 
is at the mouth of a small creek (Fig. 9). There is little or 
no protection from the rough waters of the lake. Each asso- 
ciation is made up of the following plants, arranged zonally. 
Zone A. Shore. 
Black Willow (Salia nigra var. Swamp Loosestrife (Decodon ver- 
falcata). ticillatus) . 
Narrow-leaved Cat-tail (Typha  Buttonbush (Cephalanthus occei- 
angustifolia) . dentalis) . 
Zone B. 
Borrom: Sandy, rather firm. Watrer: 12-24 inches 
deep. 
Bur-reed (Sparganium eurycar- Narrow-leaved Cat-tail (Typha 
pum). angustifolia) . 
Arrow-head (Sagittaria latifolia) . 
