STALKED DIATOMS. 



119 



also see the mode of attachment of the lower angle 

 of the frustule to the one beneath, by a kind of 

 gelatinous cushion. It is among the marine species 



o 



Fig. 78. 



Fig. 77- 



Stauroneis. 



Jsthmia enervis. 



of diatoms, perhaps, that we are to look for those 

 possessing the greatest beauty, as in Figs 79 and 80 

 (Cocconeis). Among the commonest of our native 



