The Relation of Mollusks to Fish in Oneida Lake 99 
Button-bush (Cephalanthus  occi- 
dentalis), common on shore. 
Swamp Loosestrife (Decodon verti- 
cillatus), common on shore. 
Water Willow (Dianthera ameri- 
cana), rare. 
Broad-leaved Arrow-head (Sagit- 
taria latifolia), common, near 
shore. 
Narrow-leaved Cat-tail (Typha an- 
gustifolia), common, near shore. 
Bur-reed (Sparganium eury- 
carpum), common, near shore. 
Lake Bulrush (Scirpus occiden- 
talis), common. 
American Bulrush (Scirpus ameri- 
canus ), common. 
Pickerel-weed  (Pontederia  cor- 
data), common. 
Sweet-scented Water Lily (Cas- 
talia odorata), common. 
Cow Lily (Nymphea advena) , com- 
mon. 
Floating Pond-weed (Potamogeton 
natans), common. 
Various-leaved Pond-weed 
mogeton heterophyllus), 
mon. 
Clasping-leaved Pond-weed (Pota- 
mogeton perfoliatus), common. 
Water Celery (Vallisneria spira- 
lis), common. 
Water Weed (Hlodea canadensis) , 
common. 
( Pota- 
com- 
- Hornwort (Ceratophyllum demer- 
sum), common. 
Water Milfoil (Myriophyllum spi- 
catum), common. 
Stonewort (Chara species), com- 
mon. 
Animal life is abundant on the various water plants. 
MOLLUSCA,. 
Acella haldemani, common. 
Pseudosuccinea columella, common. 
Pseudosuccinea columella chalybea, 
common. 
Planorbis campanulatus, common. 
Planorbis trivolvis, common. 
Planorbis hirsutus, rare. 
Ancylus parallelus, common. 
Physa ancillaria warreniana, com- 
mon. 
Amnicola lustrica, rare. 
CRUSTACEA. 
Amphipod (Hyalella knickerbockeri) , common. 
INSECTA. 
Dragon-fly 
janata). 
nymph  (Basiaeschna 
Dragon-fly nymph (Tetragoneuria 
cynosura) . 
HIRUDINEA, 
Leech (Placobdella picta). 
Leech (Glossiphonia fusca). 
VII. 
Leech (Glossiphonia stagnalis). 
Leech (Hrpobdella punctata). 
Cat-tail Type. (Figs. 6, 9.) 
Stations I,* I11,* XX XI.* Several habitats oceur in which 
this type of plant prevails. 
These are always near the shore 
where the water is from 1 to 3 feet in depth. 
The bottom 
here is usually muddy or silty. Vegetation consists of: 
