80 College of Forestry 
Pisidiwm ferrugineum, rare (1 
specimen ). 
*Pisidium variabile, common. 
*Pisidium compressum levigatum, 
abundant. 
Pisidiwm species, rare. 
*Amnicola lustrica, abundant. 
Amnicola lustrica, var., rare (1 
specimen). 
*Amnicola limosa, common. 
*Bythinia tentaculata, very abun- 
dant. 
Campeloma integrum, rare. 
*Valvata tricarinata, abundant. 
*Galba catascopium, abundant. 
Planorbis trivolvis, not common. 
*Planorbis antrosus, common. 
*Planorbis campanulatus, abun- 
dant. 
*Planorbis exacuous, rare. 
*Planorbis hirsutus, rare. 
*Planorbis parvus, common. 
*Physa ancillaria warreniana, com- 
mon. 
Physa mtegra, uncommon. 
INSECTA. 
Caddis-fly 
borealis). 
Caddis-fly cases (Molanna species) . 
larve  (Helicopsyche 
Habitat 2. 
Caddis-fly eases (Leptocella spe- 
cles). 
Caddis-fly cases (Limnephilid spe- 
cles). 
Typha Association. (Field No. 218). Fig. 25. 
This is a pure association of the Narrow-leaved Cat-tail 
(Typha angustifolia). 
The only other plant present on the 
surface was the Larger Duckweed (Spirodela polyrhiza). 
Borrom: Muddy, with accumulation of dead plant debris. 
Water: 16-24 inches deep. 
ANIMAL LIFE. 
MOLLUSCA. 
*Planorbis parvus, common, on *Lymnea stagnalis lilliane, float- 
dead T'ynha leaves. 
*Planorbis exacuous, common, on 
dead Typha leaves. 
*Ancylus fuscus, abundant on dead 
Typha leaves. 
*Planorbis trivolvis, abundant on 
dead vegetation. 
*Lymnea stagnalis lilliane, egg 
capsules on dead Typha leaves. 
ing in water among debris. 
Bythinia tentaculata, 2 young in- 
dividuals. 
Valvata bicarinata normalis, 1 in- 
dividual. 
Anodonta cataracta, I individual, 
1% inches long, on bottom. 
Lampsilis radiata, 1 individual, 1 
inch long, on bottom. 
Those names marked by an * may be considered as normal 
inhabitants of this habitat. 
The others have been washed in. 
