396 ALLAN HAXCOCK PACIFIC EXPEDITIONS VOL. 12 



PLATE 40 



Figs. 1,2. l.ithophyllum Farloivii. Intermediate stages in the de- 

 velopment of the chambered portion of the plant. Fig. 1 

 shows a still prominent horizontal disk \vith numerous 

 erect plates, a few of which have united to form 

 chambers. Fig. 2 shows a more advanced stage. I. Santa 

 Maria, x 0.85. 



