I90Q ] GRIGGS— AMITOSIS IN SYNCHYTRIUM 129 



lymph before the division, which is a multiple fragmentation. This 

 form of division I shall term heteroschizis (ere/oo?, different, and 

 <rx%eiv, to split) . 



NUCLEAR GEMMATION 



In nuclear gemmation, as is usual in amitosis 



O } — - _ , 



chromatin is not nearly so frequently observed as the separation of 



the two nuclei. 



rium 



chromatin content is usually concentrated in a single globular karyo- 



some (nucleolus) . 



gemmation 



of this karyosome becomes crenate, and rounded lobes develop, which 



smaller independent karyosomes (fig. 



4~8)- Sometimes only one daughter karyosome migrates from the 



(fig- 6)\ sometimes 



{fig- 7); or 



>metimes several form at once, in which case the whole karyosome 

 breaks up (fig. 4 ), pig. 8 shows a very large nucleus where the 

 daughter karyosomes were unusually numerous. They were not free 

 m the nucleus, as appears from the drawing, but all of them were 



represented. 



hemispher 



small 



grate through the nuclear membrane. This process is probably rather 



fig 



^inst it; i n fi g 



membrane; in fi 



sn ows one lying almost exactly half-way through the membrane 



h* 



close against, the membrane. 



As 



Thi 



gratin 



^ ^uuj surrounded by a membrane, extending out irom uic 

 ^a of the parent nucleus into the cytoplasm next the vacuole (fig. 10). 

 ^ process can be observed satisfactorily only when the daughter 

 c eus is of considerable size, because of the delicacy of the mem- 

 oes of the smaller nuclei. When the membrane is complete the new 

 eus moves away from the parent and becomes an independent 



