EXPLANATION OF THE ILLUSTRATION 
Pirate XXVI. PLeuroTHALLIS cRATERIFORMIS C, 
Schweinfurth. 1, plant, one half natural size. 2, 
flower expanded, three times natural size. 3, lip 
three quarters view, five and one fourth times nat- 
ural size. 
Drawn by Dororuy H. Marsu 
