322 MR. HENRY RIDLEY ON ORCHIDEZ AND 
On trees in dense jungle ; often common in the hill districts. 
A native also of Java. 
Cetocyne casta, Ridl., sp. nova. Pseudo-bulbi 3 poll. longi, 
1 poll. crassi, elongati conici, costati. Folia 2, 8 poll. longa, 
lj poll. lata, anguste lanceolata acuta, in petiolum attenuata, 
flaccida, costata. Scapus lateralis, erecto-nutans, basi a vaginis 
viridibus (summis foliaceis) tectus, ferme usque ad vaginas flori- 
ferus. Flores c. 5 magni, 3 poll. lati, speciosi. Bractew 2 poll. 
long, lanceolate acuminate, papyraces ; pedicelli 1 poll. longi. 
Sepala 14 poll. longa, 3 poll. lata, lanceolata acuminata acuta. 
Petala sepalis angustiora, lineari-lanceolata acuminata. Labellum 
sepalis brevius, ovatum; lobi laterales magni obtusi flavi 
aurantiaco-venosi, medius breviusculus ovatus cuspidatus basi 
crispo-marginatus, albus basi a macula citrind notatus ; carine in 
hypochilii disco 3 parallele, crispz, albe, in epichilio 2 externe 
adduntur. Columna obscure aurantiaca, superne alata; 
clinandrii margo elevatus, truncatus, utrinque 1-dentatus. 
Anthera campanulata, apice incrassata; rostellum latum, in 
margine sinuatum; pollinia inequalia, semi-elliptica, com- 
planata, 2 postica minora. Stigma oblongum, breve. 
Hab. Selangor: Bukit Hitam, H. J. Kelsall! 
A very beautiful plant with widely expanded flowers, 
remarkable for the acuminate sepals and petals of the purest 
white. 
C. Forrsrermanni, Reichb. f. in Gard. Chron. (1886) 1. 
p. 262. 
C. Maingayi, Hook. f., Fl. Brit. Ind., v. p. 831. 
Hab. Malacca: said to be common on lofty trees, R. Derry ! 
Pahang: Kwantan, Durnford! Tahan River! 
Also Borneo! 
I am assured by the orchid collectors that this plant is the 
one introduced from Borneo by Férstermann, and described by 
Reichenbach as OC. Foerstermanni. It is a very noble species 
but not easy to cultivate, and, as it seems to prefer the upper 
branches of the loftiest trees, is difficult to collect and rarely 
brought in by collectors, 
C. tonarpractata, Hook. f., Fl. Brit. Ind., vi. p. 194. 
Hab. Perak: Kunstler. 
C. ancusiFoLta, Ridl., sp. nova.  Pseudo-bulbi 25 poll. 
