276 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4TH SER. 
EXPLANATION OF PLATE XIII 
Fig. 1. Opuntia Helleri K. Scu., 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. ; 
