978 



XIV. ALG./E. 



Pediattrum Rotula 

 (mag.). 



Pediattrum yranulatum. Split eel', 



emitting its zoospores enveloped in 



mucilage. (A. Brann.) 



P. granulatum, 



Zoospores, free or 



enveloped in mucilage. 



(A. Braun.) 



Clotlerium Luniila. 



At the moment of 



union (mag.). 



Coffonema lanceolatum. 

 Young individuals. 



Cotcontma lanetolatum. Adult 



individual having produced a 



sporangium filled with zoospores. 



Protofoccvt niralii, 

 in various stages of growth (mag.). 



Meiocarput 



jut mil IK. 



Filaments in 



different stages 



of union. 



Slrialtltn 



interrupta. 



One of the 



transversal 



frustulfs 



seen lengthwise, 



and showing 



its strias. 



Afetotarput 



jxirvului. 



Filaments at the 



moment of 



union. 



Gomphontma fii/alinum. 

 Parasites on a filament of Conferva. 



Eunotia turgitla. 

 Solitary individual. 



Eunotia turgida, 

 enveloped in mucilage. 

 Individuals having pro- 

 duced two sporangia 

 enclosing zoospores, 

 which will each produce 

 a fresh individual. 



Striatella 



interrupta, 



with its lateral 



pedicel. 



TRIBE VI. DIATOME^E et BACILLARIEJE, Ehr&nberg, Brebisson, &c. 



Microscopic Algce (?) living in fresh, brackish, or salt water, generally prismatic 

 and rectangular, free sessile or pedicelled, naked or immersed in mucilage, and 



