94 



AQUATIC MICROSCOPY FOR BEGINNERS. 



8 GOMPHONfiMA ACUMINATUM (Fig. 69.) 



Stems often much branched, but 

 frequently found un'brahched; at- 

 tached to other plants; frustules 

 slightly swollen in the center, the 

 narrow end of the wedge being at- 

 tached to the stem (Fig. 69). 



9 EpITh£mIA TtJRGIDA (Fig. 70). 



Valves curved or bent, transverse 

 lines coarse and conspicuous (Fig. 

 70). Often found separated from 

 its supporting plant, and floating 

 freely. 



10 CoCCONfilS PEDfCULUS (Fig. 7l). 



Valves oval, with a line (raphe) down the center and 

 a small nodule in the middle; attached by one valve to 

 aquatic plants, especially to the leaves of Ankcharis 

 (Fig. 71)- . ' 



Fig. 69. — Gomphonema 

 acuminatum. 



Fig. 70.— Epith^mia 

 - turgida. 



Fig. 7i.~Coccon^fs 

 pediculus. 



Fig. 72. — Eun6tia 

 tetraodon. 



Ti Eun(5tia tetrAodon (Fig. 72.) 

 Valves curved, a small nodule at each end of the 

 concave margin; the' convex border apparently scal- 

 loped, but in reality bearing four or more rounded 

 ridges (Fig. -72). 



