BV JIAKJOKIK I. IJOI.LIXS. 



283 



An interesting feature often occurs iu the Aplaties type of sporocyst. iu wiiat 

 may be regarded as an attempt at escape of the protoplast during germination. 

 After some of the germ-tubes liave readied a certain length, a streaming move- 

 ment is observed from the body of the germinating spore. Part of the proto- 

 plasm streams to the tip of the tul)e, where a large swollen structure is formed 

 (Text-fig. 8). Tbi? swollen structure never ruptures the tip of the germ-tube. 

 but appears to function as an encysted sj-)ore from which one or two germ-tubes 

 may ultimately develo]i (Text-fig. 9). 



From these observations it seems conceivable that the Aplanes cunditiiju has 

 arisen from the Dictiiuchus condition by the delay of protoplasmic activity until 

 the length of the germ-tube renders escape ineffective. 



Formation of New Sporoeysts. 



Owing to the prevalence of Dicti/iichiis, Aplanes, and "DictyH-Aphinefi" forms 

 in which the original spoi'm-yst remains l)lockeil either by empty cyst cases or bv 



Text-fig. 10. Short Didyuchus sporooyst showing penetration of hypha at base in 

 attempt to form new sporocyst. (x 230). 



Text-fig.ll. Base of old Dictyicchus sporocyst showing lateral divergence of hypha 

 to form new sporocyst. (x 230) . 



germinating spores, the formation of a new sporocyst almost invariably takes 

 ]ilaie l)y the lateral outgrowth of the hypha from the base of the sporocyst. The 

 hypha grows forward until further progress is blocked, lateral divergences then 

 taking place (Text-tigs. 10 and 11). In this manner a pseudo-^4c/;Z(/o condition 

 is obtained. 



