lig 



locality is doubtful. His description agrees precisely with the plant which Major Reinbold lent 

 us. The supra-dichotomial constrictions are usually formed above the dichotomy at a distance 

 equal to the diameter of the filament. 



U. cyathiformis differs from U. conglutinata in having normally a cup-shaped and not 

 a flabelliform frond. Recently Dr. Howe (loc. cit.) has demonstrated that the fïmdamental 

 difference of habit which distinguishes the two species obtains even in young plants ; as is 

 shewn in his series of photographic reproductions (loc. cit. plates 2, 3.). 



Too much dependence must not however be placed on this charactér (difference of habit) 

 alone, in view of the occasional occurrence of specimens of U. cyathiformis with a purely fla- 

 belliform frond. For example Mazé's n" 99 from Guadeloupe in Herb. Mus. Brit. would pass 

 at first sight for U. conglutinata, were it not for other characters. It should be noted that 

 the corresponding specimens in Herb. Kew shew a cyathiform tendency. We have summarised 

 the most trustworthy characters for distinguishing the two species in our remarks under 

 U. conglutinata (p. 116). 



The specimens of U. cyathiformis, which we have seen, fall into two groups according 

 to the size of their frond-filaments. On the one hand, the filaments of the frond measure 

 35 — 50 u in diameter in Decaisne's type from Guadeloupe (fig. 6), and in Suhr's Codium 

 infundibulum, and in Mazé's n". 99 from Guadeloupe. The other group consists of specimens 

 whose frond-filaments measure between 50 and 100 p. ; for example, Mazé's 135 S bïs from 

 Guadeloupe. And this latter group is the commoner of the two. 



The geographical distribution of U. cyathiformis is confined to the West Indian region. 



6. Udotea orientalis n. sp. 



Syn. Udotea suborbiculata Sonder in F. von Mueller's Fragm. Austral. XI. Suppl. 1880. p. 38. 



sub n° 973. 

 Udotea Palmetta J. G. Agardh Till Alg. Syst. V. 1887. p. 71. 

 Udotea infundibulitm Hauck in Hedwigia XXVII. 1S88 p. 92. 

 Udotea Palmetta De Toni Syll. Algarum I. 1889. p. 506. 



Udotea infundïbulum Hieronymus in Engler Pflanzenvvelt Ostafrikas. Theil C. p. 24. 1895. 

 Udotea conglutinata Okamura Icones of Japanese Algae I. 1908. p. 231, plates XLIV, figs. 



11, 12, XLV, figs. 8 — 13. 

 Udotea conglutinata A. & E. S. Gepp in Trans. Linn. Soc. (Bot.) VII. 1908. p. 175; and 



in Trans. Linn. Soc. (Zool.) XII. 1909. p. 385. 



Hab. INDIC. Siboga Expedition. Stat. 64. Island Tanah-Djampeah, 30 m. n°s 261! 262! 263! ■ 

 Stat. 99. Island North Ubian, Sulu Archipelago, 16 m. ! — Stat. 133. Lirung, Salibabu 

 Island, reef! — Stat. 301. Pepela Bay, Rotti Island, reef! 

 Lamu Harbour, Zanzibar coast, covered at lovv water, Hildebrandt, n" 1918! — Bluft, Natal, 



Evans ! — Durban, Natal, Weder van Bosse\ 

 Pacific. Queensland, Cape Gloucester (fide Sonder). ■ Queensland, Cape Flattery, Algae 

 Mullerianae in Herb. Kew ! — Queensland, Brammo Bay, Dunk Island, Banfield\ — Queens- 

 land, Port Denison, fide J. G. Agardh. — Macclesfield Bank, China Sea, Bassett Smith ! - 

 Japan, Riukiu, Kuroiwa, Ando, and Kanagusuku (well figured by Okamura, loc. cit.). 



Plants varying to about 7 cm. in length, usually about 5 cm., more or less calcified. 

 Root-mass bulbous to elongate. Stipes simple, up to 2 cm. long, 1 — 2 mm. thick, corticated 



