40 



water to a slide and left undistiu'Taed, fev/ antheridia be- 

 come extruded. However, the pressure of a cover glass or 

 even a mere touch with a needle causes the extrusion of 

 hundreds of i.ntheridia from each large antheridial cap. 

 This, coupled v/ith tlie fact that the tufts of Grif f ithsia 

 are feeding grounds for several species of minute Crustacea, 

 especially of a species of Capre lla , seems to lend prob- 

 ability to the suggestion that the antheridia of the red 

 algae are sometimes transloca,ted tlirough the agency of an- 

 imals. 



xTo evidence was secured as to \7hether the antheridial 

 filaments produce successive crops of speraiatia. It is cer- 

 tain, however, that after a time the antheridial cap ceases 

 to producespermatia, and the antheridial filaments become 

 disorganized and brealc away, leaving the globose terminal 

 cell of the thallus free of any antheridial cells. Vlien 

 this occtirs, it is usual for tv/o or more side branches to 

 arise from the svibterminal cell and to begin to produce an- 

 theridia when 3 or 4 cells long (fig. 67). 



The globose terminal cell which has produced one crop 

 of spermatia frequently prod\ices one or more new branches 

 from its svimmit, so that this cell becomes again a function- 

 al apical cell (figs. 68. ). 



The procarps occur laterally on tlie nodes near the 



