276 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



EXPLANATION OF PLATE XIII 



Fig. \. Opuntia Helleri K. Sch., thicket on Tower Island. Photographed 

 by E. W. Gifford. 



Fig. 2. Opuntia myriacantha Weber^ specimens from Academy Bay, Inde- 

 fatigable Island, showing the pendant branches. Photographed 

 by R. H. Beck. 



