EXPLANATION OF THE ILLUSTRATIONS 
PLeuroTHALLis auRITA C. Schweinf. 1, plant, natu- 
ral size. 2, flower, from side, six times natural size. 
3, lip, from side, six times natural size. 4, lip, from 
front, six times natural size. 5, dorsal sepal, petals 
and column, six times natural size. 
PLEUROTHALLIS saccaTILABIA C, Schweinf. 6, plant, 
natural size. 7, flower expanded, from front, six 
times natural size. 8, lip, from side, seven times 
natural size. 9, lip expanded, from front, seven 
times natural size. 10, flower, from side, six times 
natural size. 
Drawn November 1939 by G.W.Ditton 
Hexapvesmia Fatcata C. Schweinf. 1, plant, one half 
natural size. 2, flower, from front, with lateral se- 
pals expanded, one and one half times natural size. 
3, lateral sepal, from back, one and one half times 
natural size. 4, dorsal sepal, one and one half times 
natural size. 5, petal, one and one half times nat- 
ural size. 6, column and lip, one and one half times 
natural size. 7, three pollinia, five times natural 
size. 8, anther, five times natural size. 
Drawn June 1939 by G.W. Ditton 
EpIpENDRUM CorDIFORME C.Schweinf. 1, plant, nat- 
ural size. 2, flower, from front, twice natural size. 
3, petal, twice natural size. 4, lateral sepal, twice 
natural size. 
SIGMATOSTALIX UNGUICULATA C.Schweinf. 5, plant 
natural size. 6, flower, from front, three times 
natural size. 
Drawn November 1939 by G.W.DiLi0N 
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