The figure was taken in May last from a plant in Mr. Rucker's collection where it is grown at the coolest end of the Cattleya-house. DISSECTION.--1. Front view of lip and column; 2. Side view of ditto: _magnified_. Plate VIII [Illustration: Odontoglossum grande.] PLATE VIII. ODONTOGLOSSUM GRANDE, _Lindley_. GREAT ODONTOGLOSSUM. O. (XANTHOGLOSSUM) pseudobulbis ovatis compressis diphyllis, foliis coriaceis oblongo-ensiformibus scapo simplici brevioribus, sepalis lanceolatis lateralibus convexis falcatis petalisque oblongis obtusiusculis latioribus subundulatis, labello subrotundo basi auriculato sepalis plus duplo breviore, disci cristâ apice truncatâ bituberculatâ utrinque in medio dente calloque auctâ, columnæ tomentosæ auriculis rotundatis convexis incurvis. ODONTOGLOSSUM GRANDE, _Lindl. in Bot. Reg._ 1840, _Misc._ 94; _Bateman_, _Orchid. Mex._ _t._ 21; _Morren. Ann. Gand._ i. _t._ 37. Habitat in GUATEMALA, _Skinner_, _Hartweg_. DESCRIPTION. PSEUDOBULBS _compressed, broadly ovate, 2 or 3 inches long, bearing 1 or more frequently_ 2 _leathery, oblong-ensiform_ LEAVES, _which, as well as the pseudobulbs, have always more or less of a pale-glaucous hue_. SCAPE _twice the length of the leaves, 4-8-flowered_. BRACTS _sheathing, acute, half the length of the ovary_. FLOWERS _very large, in some varieties 7 inches or more from the tip of expanded petals_. SEPALS _lanceolate, the lateral ones convex and falcate_. PETALS _wider than the sepals, and, like them, of a rich yellow colour, marked with large deep-cinnamon bands and blotches, oblong, somewhat obtuse at their extremities, and slightly waved at the margin_. LIP _not half the length of the sepals, nearly round, whitish, with a few crimson stains near the crest, which is of rich orange-yellow, marked with deep-orange spots, and is seated on the disk of the lip; it consists of 2 large truncate processes in front, with 2 or 4 small teeth at its base; its auricles turn their edges down until they meet under the disk of the lip, and there grow together_. COLUMN _downy, with a rounded, incurved, convex auricle on either side_.