PROF. OLIVER ON NEW PLANTS FROM RORAIMA. 283 



360. Zygopetalum venustum, Ridley, n. sp. (Plate XL VII. figs. 1-0.) Planta csespitosa, 

 pscudobulbis riullis. Folia bina, evoluta, lancoolata acuta, basi attcnuata, subcoriacea, 

 costis tribus clcvatis in dorso, 7 ad 8 uncias longa, § lata. Scapus lateralis ereetus, 

 13 uncias longus, vaginis 2-3, apicibus obtusis, aniplexis, paullo ampliatis rcmotis. 

 Racemus laxus, 10-florus. Flores mcdiocres, unciam longi et lati. Bracteae 

 pedicellis multo breviores, cylindricse, ovataB, acutae, inferiorcs vaginantcs. Pedicelli 

 ■i unciam longi. Scpala ovata, lanceolata, subacuta patula. Pctala subsimilia, 

 obtusioraet angustiora. Labellum integrum, mentum plicatum, lamina rbomboidea, 

 obtusa, lata. Columna brevis crassiuscula, alis magnis obtusis falcatulis, apicibus 

 cui'vis. Antbera subconica. Stigma semilunare. 

 Kookenaam River, 3000 ft. 



There is a figure of what seems to be the same species in the drawings made by 

 Schomburgk, preserved in the British Museum. It was obtained at Takootoo, and is 

 represented as having white flowers, with the base of the lip and the mentum yellow and 

 a few faint purple stains towards the apex of the lip, and purple streaks on the face of 

 the column. The fruit is deflexed, oblong in shape. In the absence of a distinct pseudo- 

 bulb, this plant differs from the rest of the genus, but the flowers are exactly those of 

 Zygopetalum. 



114. Oncedium nigratum, Lindl. 5100 ft. (our house). 



12. Oncedium orthostates, Ridley, n. sp. (Plurituberculata Homaeantha expansa.) 

 Pseudobulbus oblongus, 2 uncias longus. Folium lanceolatum oblongum, 3 uncias 

 longum, 1 unciam latum. Scapus elatus validulus rigidus ultra bipedalis. Bractese 

 lanceolatse deflexae breves ^-unciales. Flores mediocres, iis O. ccesli aequantes. Pedicelli 

 ■| unciam longi. Sepala lanceolata subacuta. Petala subsimilia viridia brunneo macu- 

 lata (ex sicco). Labelli lobi laterales spathulati obtusi, medius basi angustatus rotun- 

 datus reniformis emarginatus, cuspide minuto. Callus, carina lamellas duas breves 

 gerens. Columna brevis stelidiis obtusis magnis dolabriformibus tenuibus. Pedicellus 

 polliniorum elongatus ligulatus, discus oblongus quadratus, margine exteriore eroso. 

 Treng River ; also 23, Savannah, W. H. Campbell in Herb. Kew. 



19. Sobralla. stenophyela, lindl. Spelinioola, Arapoo River. 

 273. Sobralia (inadequate). Upper slope, Roraima. 



115. Pogonia parvifeora, Reichb. f. 5100 ft. (our house). 



312. Spiranthes bifida, Ridley, n. sp. Tubera elongata clavata. Folia ovata petiolata 

 acuta tenuia parva, lamina semiunciam longa, \ unciam lata, petiolus vix semi- 

 uncialis. Caidis debilis parce pubescens, ferine 10-uncialis ; vaginis circiter 9, laxis 

 lanceolatis acuminatis dissitis J unciam longis. Racemus densus spiralis, unciam 

 longus. Bracteae flores superantes, lanceolata? acuminatic. Sepala, petala et labellum 

 subsimilia, lanceolata angusta obtusa, marginibus involutis, apicibus bifidis, minute 



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