EXPLANATION OF THE ILLUSTRATION 
Pratre XXXIII. PreurorHatiis Tenuirotia C, 
Schweinfurth. 1, plant, one half natural size. 2, petal 
from front, three times natural size. 3, lateral sepal 
and column, three times natural size. 4, dorsal se- 
pal, three times natural size. 5, lip expanded, four 
times natural size. 6, lip from side, natural posi- 
tion, four times natural size. 
Drawn by Dorotuy H. Marsu 
