7 
3° Coalescence of one or both petals with the upper sepal, 
observed in nearly all the cases under consideration. 
4° Suppression of one of the inferior sepals, not to be con- 
founded with n° 5 in which a case of pseudo-dimery will be 
dealt with. We have to register four cases of this deviation, 
of which we describe only one (fig. 7c): one sepal, 1, is a 
little broader than usual owing to the left petal cohering to it. 
The right petal is quite free, but opposite to it is the labellum. 
Of the two lateral sepals only the right is present, judging from 
its peculiar shape and colour which precludes every thought 
of two sepals grown together. 
In three other cases, of which we represent one in fig. 7d, 
the same thing repeated itself but in the reverse order. 
5° Coalescence of the lateral sepals the whole being exactly 
opposed to the upper one. As it is well known, this phenomenon 
is normal in Cypripedilum and Paphiopedilum Pfitzer and also 
in the lowest flowers of the long raceme of Grammatophyllum 
speciosum ') where it is accompanied with suppression of the 
labellum (pseudodimery of Penzig *). This kind of dimery showed 
itself in our Rhynchostylis, as drawn in fig. Te: just opposite 
the upper sepal stands another quite regular and white, evidently 
representing the two inferior sepals of normal flowers grown 
together. The column split up into two, each of the diverging 
parts bearing a petal, partly petaloid but for the greater part 
transformed into a labellum. The left not so well developed as 
the right one. 
Paphiopedilum praestans Pfitz. 
Habitat New Guinea. 
Coll. J. J. Smith in horto bogor. 
Topmost flower of an inflorescence without labellum (fig. 10). 
Paphiopedilum glaucophyllum J. J. 8. 
Habitat Java. 
Coll. J. J. Smith in horto bogor. 
1) Botan. Jaarboek, ed. by Dodonaea, Ghent 1894. Ann. de Buitenzorg, Vol. XIII, 1895. 
2) Mémoires de la Soc. nationale des sciences naturelles et mathématiques de 
ee T XXIX, 1894. 
