146 POND COMMUNITIES 
3. THE ASSOCIATION OF EMERGING VEGETATION 
(Stations 34-37, 39; Ponds 5, 7, and 14) (Fig. ror) (30 and 52) 
With the incoming of the water-lilies and the fine-leafed plants, we 
REPRESENTATIVES OF THE DENSE BULRUSH ASSOCIATION (POND 5) 
(All about natural size) 
Fic. 95.—The common diving spider (Dolomedes sexpunctatus). The individual 
from which this drawing was made was taken with a nymph of the dragonfly shown, 
in its jaws. 
Fics. 96, 97, 98.—Various stages of a dragon-fly (Leucorhinia intacta): 96, nymph; 
97, about to shed its outer covering; 98, the adult. (Modified from Needham.) 
Fic. 99.—The larva of a caddis-worm (Phryganeidae), which makes its case from 
bits of grass blades, etc. 
Fic. too.—Small gill-breathing snail (A mnicola limosa). 
that come in, the bivalved mollusks deserve special mention. The 
Unionidae must have bare bottom for their activities; they are too large 
and heavy to climb on such small vegetation, and the development of 
such a habit has not taken place. They disappear with the sparse 
