PLATE CIX. 



Fins. 1-5. ISTUMIA NERvnsA. S. B. D., PI. 47. Figs. 1 and 2 magnified 



500 diameters. Figs. 3 -5 various positions mag- 

 nilied 250 diameters, attached to stem of Polysi- 

 phonia. 



(>-!i. ISTHMIA ENKIIVIS. S. B. D., PL 48. Figures 8, 9 magnified 500 

 diameters. Figures 6, 7 magnified 250 diameters. 



