198 THE VOYAGE OF H.M.S. CHALLENGER. 



MONOCOTYLEDONES. 



HYDROCHARIDE.E. 



Enhalus acoroides, Eicb. 



Enhalus acoroides, Rich, in Mern. Inst. Par., 1811, ii. p. 64; Griff., Ic. PI. Asiat., tt. 149 et 150. 

 Enhalus Jcoenigii, Rich. ; Miq., Fl. Ind. Bat., iii. p. 237. 



Arrou. — A submerged marine plant found on tbe coasts of Tropical Asia and Madagas- 

 car, and also collected by Mr Moseley at Cape York, North Australia. Tbe only species 

 of tbe genus. 



Halophila ovalis, Hook. f. 



Halophila ovalis, Hk. f., Fl. Tasm., ii. p. 45; Benth., Fl. Austr., vii. p. 182. 



Arrou. — A marine plant, common on tbe sbores of tbe Indian and Pacific Oceans ; also 

 occurring in tbe Red Sea. It grows botb in tbe mud tbat is exposed at low water, and in 

 water several fathoms in depth. There are two other species of the genus, both of which 

 inhabit some part of the area of Halophila oralis. 



OKCHTDE^E. 



Dendrobium phalaenopsis, Fitzgerald ? 



Dendrobium phalamopsis, Fitzgerald in Gard. Chron., N. S., siv. p. 3S, et Austr. Orch. i. 1 



Timor Laut. — It is a little doubtful whether this is exactly the same as Fitzgerald's 

 plant, which was discovered in Northern Queensland. A fragment of another species of 

 Dendrobium is among the plants from Arrou. Dendrobium numbers at least 300 described 

 species, tbe majority of which are concentrated in Tropical Asia, though the genus ranges 

 from China and Japan to New Zealand and the Marquesas Islands. 



Phreatia sp. 



Arrou. — The specimen is insufficient for satisfactory determination of tbe species, 

 though there is no doubt concerning the genus. Phreatia is a genus of about ten species 

 inhabiting India, the Archipelago, and Polynesia, and one species occurs in North-eastern 

 Australia. 



Calanthe sp. 



Wetter. — This genus numbers about forty species, mostly inhabiting Tropical Asia, 

 but a few occur in Tropical Africa, America, and Polynesia ; and Calanthe veratrifolia, a 

 common Asiatic species, is found in Queensland and New South Wales. 



