6 
Descriptions of Rhynchostylis are to be found e.g. in ,die 
Orchideen von Java, von J. J. Smith, 8S. 628; the description 
of the species retusa, as given by Smith after fresh material 
on p. 629 Le, has been reproduced below as far as necessary 
for our purpose: 
Normal flower. Upper (after the resupination) sepal broad, 
ovate, white, back light violet-pink with white edges, top with 
one or two big violet spots, besides a few small specks. Lateral 
sepals larger, slanting, the upper half of the same hue as the 
upper sepal, the lower (larger) part white. 
Petals ovate-rhombic, white, with a large spot near the top 
and several smaller, transverse, of a violet-pink colour on the 
rest of the surface, back violet-pink in the middle, claw and 
top whitish. (fig. 7 a). 
The deviations how to be registered have all been observed 
on one inflorescence, they may be divided into three 
groups, viz. 
1° Transformation of the lateral half of the labellum into an 
ordinary petal appearing from the broadening of the basal part 
and the laminar part growing narrower. This alteration is al- 
ways unilateral and causes a little displacement of the labellum, 
either to the right or to the left side, according as it affects 
the left er the right half. The spur, strongly compressed in this 
genus, shows the displacement very distinctly owing, of course, 
to the twisting caused by the unequal growth of the claw of 
the labellum. In our fig. 74 the labellum is slightly turned to 
the right whereas the spur points to the opposite side. 
For completeness’ sake it should be mentioned that the trans- 
formed half of the labellum, according to the observation of 
Mr. Smith who saw the fresh material, not only takes the shape 
of the adjoining petal, but also its colour. 
2° Appearance of stamens which in ordinary circumstances 
are suppressed. We saw three cases of this reversion in our 
flowers, viz. of the anther indicated in Masters’ diagram either 
by a’ or by a? (fig. 74) and consequently representing the two 
antipetalous stamens which in Cypripedilum appear normally. 
