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palis oblongis obtusis petalisque conformibus subæqua- 
libus, labello unguiculato reniformi basi bituberculato, 
columnæ alis lateralibus subtruncatis dorsaliq. rotundato 
denticulatis.——Mexico.—— Flowers very large, white, 
stained with pink, and a violet-coloured lip. 
3. O. pulchellum (Bateman in Bot. Reg. 1841. t. 48) ; pseudo- 
bulbis oblongis compressis ancipitibus diphyllis, foliis 
linearibus (vix semuncialibus pedalibus) apice obliqué 
emarginatis, scapo foliis æquali ancipiti debili apice ra- 
cemifero 6-7-floro, sepalis ovatis acutis, petalis obovatis 
acutis subundulatis, labelli trilobi laciniis lateralibus tri- 
angularibus intermedià oblongà subquadratà apice re- 
curva: callo baseos carnoso antrorsum hippocrepico 
retrorsúm trilobo, columnz alis et clinandrio laceris.—— 
Guatemala.-——'The more striking features in this spe- 
cies are the long thin pseudobulbs, the very narrow 
grassy leaves, and a single protuberance at the base of 
the white lip. "This protuberance is deep yellow spotted - 
with crimson, very fleshy, firm and shining, and is almost 
horseshoe-shaped in front, while it is distinctly three- 
lobed behind, in consequence of two deep depressions. 
4. O. Egertoni ; facie O. pulchelli sed floribus dupló mino- 
ribus, labello acuto basi excavato dentibus duobus supra 
excavationem inflexis posticè rotundato cordato.—— 
Guatemala ?——-This is known in gardens as a variety 
of O. pulchellum, than which it is smaller in all its parts, 
and from which it differs in the lip being quite acute, 
not almost truncate, with an excavation at its base in 
lieu of the triple fleshy tubercle of O. pulchellum. 
Flowers pure white. | 
5. O. crispum (Lindl. in Ann. Nat. Hist. 15. 256); foliis lan 
ceolatis scapo multifloro paniculato (nunc brevi racemoso) 
brevioribus, sepalis ovato-lanceolatis, petalis ovatis acu- 
tissimis crispis membranaceis, labello subconformi den- 
tibus duobus validis in fronte paucisque minoribus 
utrinque versus laminæ basin, clinandrii alis lateralibus 
rotundatis laceris posticà nullä.—— Bogota.—— A most 
beautiful species, occasionally as much as three feet high 
and more. Flowers large, yellow, with a purple centre. 
6. O. roseum (Lindl. in Benth. Pl. Hartweg. p. 151); foliis 
oblongo-lanceolatis racemo gracili duplo brevioribus, 
bracteis ovatis concavis subangulatis pedicellis duplo bre- 
