habit, and, to a certain extent, geographical distribution 
which are accompanied by peculiar modifications of the 
parts of fructification. In Aerides the spur is an inte, 
gral portion of the Labellum; in Aeranthes, of the Co. 
Jumna! derides has the solid pollen-masses attached to 
a long elastic process, as in Vanda; while deranthes has its 
pollen-masses of the same number, but hollow, with a 
small perforation on one side, and no process whatever, 
at least not when the flower is fully expanded. | 
~ Among the curious Orchideous plants, for a knowledge 
of which the world is indebted to the perseverance of M. 
du Petit Thouars, are two plants, native of the isles of 
France, Madagascar, and Bourbon, which are referable to: 
this genus. ‘The first resembles A. grandiflora strongly in 
habit, but is essentially distinct. It may be called, 
A. arachnitis, foliis apice emarginatis scapo radicali suberecto longioribus, . 
Dendrobium Arachnitis. Pet. Thouars hist. orch. afr. t. 88. 
The second is a plant with large white flowers, and na- 
tive of Madagascar. ‘It may be called, 
‘A. sesquipedalis, cornu longissimo filiformi, spicis vaginatis axillaribus. 
' Angrecum sesquipedale. Pet. Th. 1. c. tt. 66 et 67. 
The following is a list of the other genera of that section 
of Epidendrece to which derides and Aeranthes belong: — 
EPIDENDRER. Sect. 1V. Calcarate, vel saccate; polliniis duobus. 
VANDA. Brown in bot. reg. f. 506. ae 
SarcantTHus. - Nob. Labellum carnosum, integrum, saccatum, 
sepalis patentibus, regularibus, subconforme. (Cymbidium 
premorsum. Willd.) - — mbes 
AERIDES. Swartz in Schrad. diar. 1799. p. 233. t. 2. f. 4. 
AERANTHES. Nob. in pag. opp. - 
_Tonopsis. Humb. et Bonpl. nov. gen. et sp. 1. t. 83. 
We were formerly, judging from the figure in the work just 
cited, disposed to think with Meyer, that this genus was re- 
ferable to Oncidium. We now believe, however, that. the 
original species must be placed with Dendrobium utriculari- 
oides and testiculatum of Swartz, which certainly belong to 
. this section. 
EvLopuHiA. Brown in bot. reg. t. 686. 
|’ AnGR&cuM. Pet. Thouars hist. orch. afr. passim. : 
ffontA. Nob. Labellum membranaceum, cucullatum, 3-lobum, 
horizontale. Perianthium explanatum, liberum, secundum, 
_Pollinia duo postice 2-loba, glandulis propriis, filo nullo.—Sp, 
Hionia Auberti Nob. | Epidendrum volucre Pet. Th. 1.c. t. 81. 
Crytopus. Nob. Labellum membranaceum horizontale, libe- 
rum. Sepala heteromorpha, lobata, unguiculata, explanata, 
basi distantia. Pollinia 2, integra, filis et glandulis propriis 
in bursis totidem clinandrii occultis!—Sp. Cryptopus elata 
Nob. Angraecum. elatum Pet. Th. 1.'c. tt, 79, 80. qi ae 
