EXPLANATION OF THE ILLUSTRATIONS 
Pirate XVII. PLeurorHatiis EcHtNocarPA C, Schweinf. 
1, plant, one half natural size. 2, flowerand ovary, from 
side, twice natural size. 3, lip from above, natural po- 
sition, five times natural size. 4, lip from side, natural 
position, five times natural size. 5, dorsal sepal, twice 
natural size. 6, lateral sepal, twice natural size. 7, petal, 
twice natural size. 
PLEUROTHALLIS BREVISPICATA C. Schweinf. 8, plant, nat- 
ural size. 9, flower and ovary from side, three times 
natural size. 10, lip from above, expanded, five times 
natural size. 11, lip from side, natural position, five 
times natural size. 12, dorsal sepal, three times natural 
size. 13, lateral sepals, three times natural size. 14, 
petal, three times natural size. 
Pirate XVIII. PLeurorHALiis INAEQUISEPALA C. Schweinf. 
1, plant, natural size. 2, flower and ovary from side, 
natural position, five times natural size. 3, dorsal sepal, 
five times natural size. 4, lateral sepals, natural posi- 
tion, five times natural size. 5, petal, five times natural 
size. 6, column and lip from side, ten times natural 
size. 7, lip expanded, ten times natural size. 
PLEUROTHALLIS TENUIS C. Schweinf. 8, plant, natural size. 
9, flower from side, two and one half times natural size. 
10, dorsal sepal, five times natural size. 11, lateral 
sepals, natural position, five times natural size. 12, 
petal, five times natural size. 13, column and lip from 
side, ten times natural size. 14, lip from above, ex- 
panded, ten times natural size. 
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