ILaguna Ratine ILaboratorp 



201 



CHORDARIACEAE 



Cylindrocarpus berkeleyi (Grev.) Crouan 

 Frequent on rocks and on shells in the middle tidal zone. 



RALFSIACEAE 



Ralfsia clavata (Carni.) Farlow 

 Frequent on rocks of the high tidal zone. 



Hapterophycus canaliculatus A. and G. 

 In large colonies on the rocks of the lower tidal zone. 



LAMINARIACEAE 

 Eisenia arborea Areschoug 



(Figure 109) 



Abundant on rocks about the low tide mark, commonly growing 

 on the borders of deep channels, and attaining a length of six feet. 



C 



E 



Figure 114. Nemalion lubricum Duby. 



