EXPLANATION OF THE ILLUSTRATION 
Piate IV. Srevis arrinis C, Schweinfurth, 1, plant, 
two thirds natural size. 2, flower from front, ten 
times natural size. 3, petal, twenty times natural 
size. 4, lip from side, twenty times natural size. 
5, lip from front, twenty times natural size. 
Drawn by E.mer W. Smita 
