Life-cycle of Claihrocystis mruginosa. By P. Martin Duncan. 19 



ceased, and before it bad done so, a most remarkable movement 

 began amongst the gonidia. They shot out at regular intervals, one 

 after the otlier, on all sides of the frond, about one moving every 

 five seconds. Each passed through the hyaline, being ejected with 

 force, and carrying a definite amount of homogeneous substance 

 with it. The escape was on all sides, and regular as to time and 

 place ; hence, after a while, the frond was surrounded by concentric 

 rings of gonidia, each one being distinct, and separated from its 

 neighbours by its hyaline. 



The escape became slower and slower, and ceased, the fronds 

 having lost about one-third of their gonidia, and their homogeneous 

 substance having become thinner. The hyaline was not ragged, 

 but the dark lines were more distinct in it. One fact was evident, 

 that the hyaline surrounding the mass of escaped gonidia occupied 

 a space larger than the whole frond. 



No independent motion was noticed in the gonidia after theu' 

 ejection, but they were jostled here and there by new outcomers ; 

 they always reta ined their coat of hyaline, and never came in 

 absolute contact. Subsequent watching under high powers in- 

 dicated that division of the gonidia occurred longitudinally, and in 

 some rare instances a tetrad condition was observed. 



The division of the gonidia was accompanied by a growth of 

 hyaline and homogeneous substance, so that they soon separated 

 and formed small globular aggregates, miniatures of the parent 

 frond. 



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