keeled beneath; nerves parallel. . Scapes about half the 
length of the leaves, slender, terete, 1-2-flowered; bracts 
subulate-lanceolate, half an inch long, green ; pedicels exceed- 
ing the bracts, gradually passing into the slender grooved 
ovary. Vowers three to three and a half inches across, but 
probably variable in size, almost as large as and closely 
resembling in form those of O. vewillarium ; perianth quite flat. 
Sepals subequal, one and a half inches long, the dorsal rather 
the narrowest, obovate-oblong, acute, snow-white. Petals 
as large as, and altogether similar to, the lateral sepals, but 
with a broad red-purple band across their breadth towards 
the base. zp very large, two to two and a quarter inches in 
breadth, broadly obeordate with a mucro in the notch, very 
shortly clawed, snow-white, with faintly yellow marblings, 
tinged with pale red on the disk above the base; a small 
spur-like horn arises on each side of the base of the claw, 
and is directed upwards and backwards, one on each side of 
the column ; and there are five short slender ridges on the 
disk in front of the interval between the spurs. Column not 
winged.—J. D. H. 
Fig. 1, Front; and 2, side view of portion of lip and column :—magnijied. 
