The Relation of Mollusks to Fish in Oneida Lake 39 
Zone C. Water 3-4 feet deep. 
This association is protected from the rough water of the 
lake by the vegetation of Zone D. 
FLOATING LEAVES. 
Sweet-scented Water Lily (Casta- 
lia odorata). 
Cow or Yellow Lily 
advena). 
(Nymphaea 
Floating Pond-weed (Potamogeton 
natans ) . 
SUBMERGED PLANTS. 
Clasping-leaved Pond-weed  (Po- 
tamogeton perfoliatus). 
Water Weed (Elodea canadensis). 
Water Milfoil (Myriophyllum spi- 
catum). 
Stonewort (Chara species). 
Hornwort (Ceratophyllum demer- Water Celery (Vallisneria — spi- 
sum). ralis). 
Zone D. Water 114-5 feet deep. 
Water Willow (Dianthera ameri- Lake Bulrush (Scirpus occiden- 
cana). talis). 
Pickerel-weed (Pontederia cor-  Bulrush (NSeirpus smithit). 
data). Sedge (Carex trichocarpa). 
Arrow-head (Sagittaria latifolia). 
Zone LD) consisted of a number of small colonies of Water 
Willow, Pickerel-weed, Arrow-head and Sedge. 
Bulrush was generally distributed. 
distinct semicircle sharply dividing Zones B and D. 
Fig. 6.) 
ANIMAL 
The Lake 
Zone C formed a very 
(See 
LIFE. 
Animal life was notably abundant in Zone C, on the upper 
and lower sides of the pond-lily leaves, and among the sub- 
merged vegetation. 
sides insects. 
Eight forms of mollusks were noted, be- 
MOLLUSCA, 
Acella haldemani, all adult. 
Pseudosuccinea columella, halt 
grown and adult. 
Pseudosuccinea columella chaly- 
bea, half grown and adult. 
Planorbis campanulatus, adult. 
Planorbis trivolvis, half 
and adult. 
Planorbis hirsutus, adult. 
Physa ancillaria warreniana, 
young and adult. 
Amnicola lustrica, young. 
grown 
