128 



Aquatic Organisms 



summer, adhering to every solid support that offers, 

 and it is an important part of the summer food of many 

 of the lesser herbivores in such waters. 



Then we must not omit to mention two that, if less 

 important, are certainly no less interesting: Drapar- 

 naldia (fig. 45^) which lets its exceedingly delicate sprays 

 trail like tresses among the submerged stones in spring- 



FIG. 49. Coleochate scutata. "Green doily." 



fed rivulets; and Coleochczte (fig. 49), which spreads its 

 flattened branches out in one plane, joined by their 

 edges, forming a disc, that is oftenest found attached to 

 the vertical stem of some reed or bulrush. 



Miscellaneous lesser green alga Among other green 

 algae, which are very numerous, we have space here for 

 a mere mention of a few of the forms most likely to be 

 met with, especially by one using a plancton net in open 

 waters. These will also illustrate something of the 



