398 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 12 



PLATE 41 



Fig. 1. Lithophylliun Farlo^ii. An advanced stage in thallus 

 formation, with the horizontal portion nearly covered 

 by vertical plates, those in the center (top of the figure) 

 joining to form complete chambers, but those near the 

 lower margin yet separate. I. Santa Maria, x 0.85. 



, 



