The Relation of Mollusks to Fish in Oneida Lake 121 
dredge. In the case of the plant communities, the count was 
for each leaf of each plant and the number of plants esti- 
mated to grow on a square foot of water. In the latter case, 
this often meant a columnar area one foot square and of a 
height varying with the depth of the water. These estimates, 
and the tables, are not to be taken as final, as they are, at 
most, general estimates. 
Quantitative Tables. In the following tables, examples 
are given of the number of individuals found in one unit area 
of each characteristic habitat. 
Quantitative Table No. 3. 
SHORE HABITATS. 
Three types of habitats are included: 1, sandy bottom, 
with a few stones, water 6-8 inches deep, mollusks on stones 
and in loose valves of Unios; 2, sandy bottom with but few 
stones, water 6-10 inches deep; 3, very stony or bouldery bot- 
tom, water 6 inches deep. It is to be noted that the first men- 
tioned is the most prolific of the shore habitats including 9 
species represented by 115 individuals. The poorest is one 
of the bouldery habitats (3, XX VI) in which there are but 
2 species and 18 individuals. 
TABLE NO. 3. 
Hapsirat Type. 1 2 3 
SratTion NuMBER. OXON: || TT VALE. | SRV | XXV.|XXVI. | XXX,| XXXII. 
4. | | 2-1 
Ancylus parallelus........ 1A ee St Sivan | Moon acco \Waécoot de 
Planorbis hirsutus........ 1 Sol ee rare [Liedtey shel [Pra eyeseve | PEAAREC oo 
Planorbis companulatus. . . 1 i v4 NIE ae oy ee nea Feces ere:. yllomeeses Al] Mama cee = 
Planorbis binneyi......... 1 | SIG |e ole pees | earcter re 1 
Galba catascopium........ 7 1 11 ol Resor, ee cae ee ls, ee 
Physa ancillaria warren-| 
BOM Gerba emer Aonect le. <fa the 2 3 Lee SO | 14 | 16 | 1a Wee esee as 
Bythinia tentacuiata....... PPM | ate ial ora lisesi’ dlneuines arial lke Bey eter Shere 
Amunicola lustrica......... 49 lee niet Pre Satene. Wibcrsetate Wie sverere [Lk actetenete eve 
Campeloma integrum...... 1 { 19 | 5 NP RES erage Se 
Elliptio complanatus......) ..... ¥? 7 axe ee ere eS os al] eo See 
Lymnea stagnalis Lilliane.| ..... 1 ae 6 8 | 2 r 20 
Spherium vermontanum. .. 20 ae shat || oie ateca shall ewtazeien | Mevssaveliere iat 
MOGAIBE tc.ceet sete ct | 115 | 40 46 59 22 18 22 | 21 
| | 
