PLATE CYI. 



FIGS. PAGE 



1-4. Xanthidium armatum var. cervicorne W. & G. 8. 



West. 1, x 430; 2-4, single spines, x 520 55 

 5-9. X. Mibltastiferum West. 5, x 400; 6, x 430; 



7-9, three specimens showing irregularities 



which sometimes occur. 7 and 9, x 500; 



8, x 430 . . . 56 



10-1 J. X. subliastiferum var. Murray I W . & G. S. 



West, x 430 57 



