JOURNAL OF MICROSCOPICAL SCIENCE. 



DESCRIPTION OF PLATE XIII, 



Illustrating the Rev. E. O'Meara's paper on Some Peculiar 

 Forms of Navicula from the Sulu Archipelago. 



Pig. 1. — Navicula Chimmoana. 

 „ 2. — Navicula Suluensis. 

 „ 8. — Navicula spiralis. 

 „ 4. — Navicula nnipunctata. 

 „ 5. — Navicula biputiclata. 

 „ 6. — Navicula plutonia. 

 X 400. 



