Moore. — Study of Trout Diseases. 



79 



carriers of the organism suggests their entry through the stom- 

 ach wall, thence into the blood stream, and finally into the 

 epithelial cells, where developmental stages resulting in the dis- 

 organization of tissue take place. 



The motile adults whose habitat is the lumen of the intes- 

 tine move about in the mucous discharges of the epithelial 

 cells. They may be found at any point along the intestinal 



Fiu. 2. — The life cycle of Octomitus salmonis. I represents an epithelial cell 



paissitir.ed by two ornranism?, a juver-ile and a later stage before the emergence of 

 an aflult. I-II-, side chain showinjr multiple fission. II. adult motile form common 

 in the lumen of the intestine, ill, an encysted adult within the lumen of the intestine, 

 tlie 4-nucleate stajre of a temporary spore. IV, a more advanced stage of III. V, 

 a juvenile (merozoite). obtained from culture material by ivioculn f/M u with n'ialts. 

 Stages I-V, asexual cycle which may be repeated many times within the host fish. 

 VI, binary fission simulating budding, a stage initiating development of a resting 

 spore with a hard, resistant wall. VII and VII,, two types of resting spores. VIII 

 and VIII], ge'-mination stages of resting spores, produced in cultures. IX and IXi, 

 Bporozoites (?), produced in cultures. 



