HIGHER PLANTS 



Animal associates. — The under sides of lily pads are hatch- 

 eries for eggs of beetles, snails, the caddis fly, Tricenodes, and 

 water-mites, as well as the homes and foraging grounds of 

 bryozoans, sponges, and snails (Fig. i8). Minute black 

 insects, known as thrips, abound in the blossoms near shore. 



Mustards and Cresses — CriicifercE 



Water cress, Radicula Nasturtium-aquaticum. — Among the 

 near relatives of this cress are other water cresses and the 



Pig. 77. — Common water cress, Radicula Nas- 

 turtium-aquaticum. 



95 



