12 



while the terminal cell is usually uninucleate (DAVIS, »98; 

 0I.TI'.!A2T1T{? , 'OS; r. «9). SCmaTZ, who first called attention 

 to this fact (»79a), showed also that even in the different 

 species of a single genus the numter of nuclei in the cells 

 iarles greatlj', For example, in the genus Callitliamnicn , 

 all the cells in the thallus of C . plujiula are uninucleate; 

 in C. cor^Tnoosum the older cells sjre multinucleate; in 

 C« Borreri even the youngest cells liave tv/o or more nuclei. 

 Obviously, then, the nuuiber of nuclei in the cell is no in- 

 dex of relationship in the red algae. 



The nuclei of Griffi t hsia Eornetia n a are pretty uni- 

 fci^mly distrihuted tlirough the cytopla.sm, THiile the dis- 

 tance sep8j:'ating them vaj^ies somev/he.t with the a,ge a,nd con- 

 dition of the cell, usually it is 25-30 f»^ . Hot infrequent- 

 ly several nuclei, with the cytoplasm imjnedicitely sur- 

 rounding them, form sma.ll clumps which project into the 

 central vacuole (fig. 9 ) . In the cytoplasmic pad on the 

 CEOss wall 10-15 nuclei usually form a ring around t}ie 

 intercellxilar pore (fig. 10) , 



The size of the nuclei vejries considerably with the 

 age of the cells, as has been shown by BERTHOLD to be the 

 case in the coenocytes of Codium (81) . In the young cells 

 the resting nucleus is, on an average, about 4 f^ in diaroeter 



