126 
On the mentioned place in the rivulet some larger stones were 
found, quite covered by Potamogeton pectinatus, Fontinalis antipyretica 
and Jungermannia sp. Across these plant-covered stones there were 
rows or Chains, somewhat curved, of connected, trumpet-shaped catching 
nets. Fig. 1 represents a part of such a chain, and we may see, how 
the trumpet-shaped web is always supported by, attached to and 
held on by parts of the plants. The plants often had been spun 
into the net, and in many cases the one net was placed a little 
behind the others and connected with them by a strong web. Some- 
times there where, on the larger stones, two rows of catching nets, 
the one 6—8 cm. behind the other. The trumpet terminated in a 
spun tube, which was so long and wide, that it could just give 
space for the larva, which was always seen with its head in the 
bottom of the trumpet. 
The mentioned tubes were always quite hidden down in the 
mass of plants. Where the walls of the trumpet were not concealed 
or made by parts of plants, they consisted of a delicate spin, for- 
ming fine regular, rectangular meshes. The upper outline of the 
net, seen from above, would always be curved backwards (Fig. 2). 
The nets were not large. The mouth opening to the trumpet 
was, at an average 8—10 mm. in every direction, and the depth 
down to the bottom of the trumpet ca. 7 mm. 
22—12—1908. 
