I. 



OF AN INCH. 



Characteristic Forms of the Sporangia and Spores of Saprnlegnia. 



I. — A zoosporangium full of nearly ripe zoospores from the skin of a 

 living diseased salmon. 



II. — An empty zoosporangium, through the centre of which the hypha 

 is growing in order to produce a new zoosporangium. From the fresh 

 growth of Saprolegnia on the diseased jaw membrane of a salmon, cut off 

 and placed in water. 



III. — A dictyosporangium from salmon Saprolegnia cultivated on a dead 

 fly. Tlie spores have remained in the interior of the zoosporangium, and, 

 after encasing themselves, have there germinated. 



IV. — Zoospores of salmon Saprolegnia, germinating in water. 



V. — An oosporangium of Saprolegnia from the pike, cultivated on a 

 dead fly. The oosporangia of the salmon fungus in all respects resemble 

 this. 



Signification of the letters: — hi/, hypha; zspn, zoosporangium; zspr, 

 zoospore ; oospii, oosporaugium ; oo«/)r, oospore ; anih, antheridial filament; 

 aft, antheridium. 



