90 



3c±;=?c 



Figure 2. 



oi>i)Osite direction. A case of this kind is also shown liy A. Tnlndie' and in 

 the above mentioned form. 



In some other cases, as has been round Ik'Ioit. tiirce tiiauients of 

 Spirogyra crassa conjugate with oni' anotinM- without re.^nilarity. as is seen 

 in Fig. .'>. Part of the time the contents of tlu> cells move from the fila- 

 ments A to P., in some cases from P> to .\ and in others from B to ('. 



Figure 3. 



In another instance in this material thnv filaments of Spirogyra 

 crassa were found connected by conjugating tubes.' In Fig. 4 the cells of 

 the two outer filaments A and C were in some cases conjugating witli the 

 cells of the filament P>. and thus forming a single Zygosjtore fi-om the cou- 



1 A Trondle — Uber die Kopiilation iind Ivcimiing von Spirogyra Botanische' 

 ZeitiiDK. 1907. Vol. 65, p. 192. 

 - A. TroDdle 1. c. 

 3 Bennett and Murray, Cryptogamic Botany, p. 267. 



