Fig. + 
Vig. 
Fig. 
Fig. 
Fig. 
College of Forestry 
PAGE 
. Diagrammatic map of vegetation island in outlet at Brewer- 
GOT She Laie oo aesGiheee S shoteieen Sek epe eee Oko ror ee 104 
: Big Bay from Shepard, Pomt. 2. .-">3:. 2-25). -2- ae 105 
. Diagram illustrating maximum quantity of mollusks in one 
square foot of a boulder habitat......0..~.2:2.) eee 122 
. Diagram illustrating minimum quantity of mollusks in one 
square foot of a boulder habitat 4... 54.240.) 2 eee eee 123 
. Diagram illustrating minimum quantity of mollusks in one 
square foot of asandy habitat... 1144-1: -c1,ce.4e oe 128 
. Diagram illustrating maximum quantity of mollusks on one 
square foot of a sandy habitat...) ..5.-))-:.. 33), va qeeoeee 131 
}. Diagram illustrating quantity of mollusks in a sandy habitat 154 
. Diagram illustrating quantity of mollusks in a square foot 
of vegetation... 2. ssn. hose e+ © <ipeytene aioe aoe eee 136 
. Diagram illustrating quantity of mollusks in a square foot 
ofa Lypha marshy, i . bipeeset ae aes Ae 138 
. Diagram illustrating relation of certain mollusks to vegeta- 
(0) Cee an See Rn enn PEMA RMR ee es BENS 5¢ ba 7: 140 
. Fresh water mussels, Hiliptio, Alasmidonta, Margaritana.... 250 
» Hresh water mussels, Anodonta: 2.5. 445 «yee eee 254 
. Fresh water mussels, Strophitus, Lampsilis............... 258 
= Ereshswater mussels; Wampsilisa eset ae ie ee eee 262 
> Bresh) water mussels,» amypsilis sens 1-1 4. e eee 266 
. Fresh water snails and small bivalves...................- 270 
. Large fresh water snails, Campeloma, Lymnaea, Planorbis... 274 
. Fresh water snails, Galba, Goniobasis, Planorbis........... 278 
. Opercula” of small ‘gastropods: .¢,...)...9.4- y- c9.2is eee 287 
. Flat-bottomed dredging boat on the Mississippi River 
nieged with crowloot dredge. =...) 2. 29.7). se ee 312 
Summer Field Laboratory near Brewerton............... 312 
All photographs and other illustrations were made by the author except 
when otherwise stated. 
