800 MR. H. N. RIDLEY—AN ENUMERATION OF 
olivaceis, intus glanduloso-pubescentes rufi, carinis elevatis 
lamelliformibus albis, inter eos pubescentibus, lobo medio ovato 
acuto, haud unguiculato albo, callo mammillari, flavescenti-pur- 
pureo, marginato ad basin (prope apices carinarum) maculá vio- 
laceá pubescenti in disco. Columna valde arcuata purpurascens, 
stelidiis latis linearibus obtusis, pede elongato subtereti, albo, 
dentibus nullis. Anthera conica elongata, purpurea, antice flava, 
apice obtuso, margine rotundato.  Pollinia 2 aciniformia acuta, 
pedicello unico, plano, apice dilatato. Rostellum grande trian- 
gulare, album. 
Sarawak (H. .Everett!) Also in Perak, Malay Peninsula, 
V. V. 
This very curious plant is an ally of Thecostele Maingayi, 
Hook. f., but differs in the flowers being secund and in the form 
of the lip, which in the latter (as figured in the * Icones Plan- 
tarum, t. 2118) has two hooked processes replacing the lamelle 
between the two lateral lobes, and no callus in front of them. 
There is a figure of evidently the same plant among Scortechini's 
drawings, and I saw it also alive in a garden in Thaiping, Perak. 
In describing this species I have called the tubular nectary 
running from the base of the erect portion of the column, the 
column foot, although I have little doubt but that it consists 
partly of column and partly of the claw ofthe lip. A comparison 
with the allied genus Acriopsis gives the key to the structure of 
the lip and column of Thecostele. In A. javanica, Reinw., the 
base of the lip is adnate by its margins to the margins of the 
column. ‘This portion is erect in Acriopsis, horizontal in Theco- 
stele, the upper part of the column being much prolonged and 
arched over the horizontal nectary. “This being so, the small 
divisions at the base of the lamina (represented as hooked in 
T. Maingayi, ic. cit.) represent the lamell; of the disc of Acri- 
opsis and not the lateral lobes. Indeed, in Z. Maingayi, Hook. £., 
they are figured as rising from between the larger rounded lobes 
and not behind them. Comparison with other species of 
Thecostele show this quite clearly. The lateral lobes are erect 
rounded bodies, and the mid-lobeis ovate. The pollinia are very 
different from those of T. Zollingeri, Reichb. f. ; they are almost 
spindle-shaped and acute at the apex, and borne on a single 
narrow flat pedicel, dilated at the apex. In T. Zollingeri, 
Reiehb. £, they are more globose and borne on two distinct 
pedicels ending in a large dise. In 7. Maingayi, Hook. f., the 
