346 MR. HENRY RIDLEY ON ORCHIDEH AND 
spreading lateral lobes of the acute terminal lobe, and the 
absence of calli. The habit is that of Esmeralda Clarker, 
Reichb. f. It is so distinct from all other genera known to 
me that it should, I think, form the type of a distinct genus, 
and for this plant I would suggest the generic name of 
STavrocui.vs, alluding to the cross-shaped lip. 
The remaining genera of spurless Sarcanthew are Phalenopsis, 
Doritis, and Diploprora. 
In Acampe, which has sometimes been referred to the genus 
Saccolabium, the spur is really so slightly developed that some 
of the species might well be referred to the spurless group. 
I do not see any good reason for merging it in Saccolabiwm, as 
has been done in the ‘ Flora of British India.’ 
Sarcanthee Calcarate. 
I have classed as spurred Sarcanths, all in which the 
labellum is so depressed that a protuberance is formed on the 
under side, 7.e., the morphological under-side. The dimensions, 
form, and position of the spur vary very much in the different 
genera. The greater part of the East Indian species, being 
fertilized by Diptera or Hymenoptera, have short spurs, while 
those of Africa and America, being fertilized by Lepidoptera, 
have long spurs. 
It would appear at first sight that the position of the spur, 
7.e., Whether epichilary or hypochilary, would be of value in 
classifying the genera, but I have found it often so difficult to 
determine where the hypochil ends and the epichil begins that 
I am quite unable at present to utilise this as a differential 
point. 
The variations in the direction of the spur in the open flower 
are very remarkable. In Trichoglottis and Rhynchostylis it 
points backwards in a horizontal direction, parallel to the plane 
of the lamina of the lip, and at right angles to the column. In 
Renanthera and Saccolabium it is vertical; while in Sarcochilus 
it points forwards, lying in a plane at right angles to the 
column. 
The whole section can be divided into those which have a 
foot to the column and those which have not; the latter include 
the larger number. 
The subsection Apode includes the Renanthera group, Renan- 
thera, Renantherella, Vanda, with large or conspicuous flowers and 
