the sea-shore. I have at hand a sketch, of his figuring, with pseudo- 
bulbs five inches high. There is no doubt that the majority of 
specimens in our collections come from Mr. Linden. It would, 
however, appear from a memorandum in my herbarium that the 
Lindenian specimens were gathered on the Amazon river by 
Mr. Wallis. The plant is a very untractable one, as it appears, 
and will disappear in a few years from our collections. The 
perigone is usually pallid green; it is, however, brownish in 
Surinam, as it is represented by Focke! and described by Sphit- 
gerber! while Mr. Wallis states it to be pallid green at Para. The 
lip is white, with some yellow on the base of the callus and some 
violet or purple streaks around or on the callus. The callus, 
however, has been observed entirely purplish by Focke. The 
projecting part of the caudicle is shining brown from the 
clandule. : 
I have removed the plant from Zygopetalum, since it is inter- 
mediate between that genus and Batemania. ‘There is a great 
inclination in the Zygosepalum rostratum to have such a pouch in 
the lateral sepals as is seen in Batemania fimbriata. 'The pollen 
apparatus and the anther are, however, very distinct both from 
those of Zygopetalum and of Batemania. 
Rhizome scandent or twining. Aérial roots thick, undulate, 
intricate. Sheaths distichous, scariose, triangular-acuminate, the 
highest often equalling the pseudobulbs, as in Ornithidia. Leaves 
beneath the pseudobulbs sheathing, with a papyraceous cuneate 
oblong-lanceolate acuminate blade, the middle nerve prominent 
on the lower side. Old pseudobulbs ligulate ancipitous or pyri- 
form depressed, the younger ones smooth and shining, the old 
ones wrinkled, all one-leaved. Leaf from the cuneate base 
ligulate or oblong-lanceolate acuminate, with a very distinct 
middle nerve, the other nerves not prominent. Jlower-stalk out 
of the axil of the uppermost sheath beneath the pseudobulb, one- 
to three-flowered, with three sheaths. Bracts lanceolate acuminate, 
longer than the pedicellate ovary; flowerless bract shorter. Bud 
from the wide base attenuate in an ascending beak, with an abrupt 
part before the base. Sepals and tepals lanceolate acuto-acuminate, 
undulated, with reflexed tips. Lip oblong apiculate or trans- 
verse ovate, three-lobed, acute, with a saddle-like oblong callus, 
dilated on both sides, projecting in a toothed or serrate blade. 
Column trigonous, with round wings on both sides of the stigmatic 
hallow, and the back of the anther-bed resolved into bristles. Anther 
