m. high, tufted, arising from a harder common base, very ure- 

 pila, m. long, spongy, congregated, often concrescent, usually 



stiptl ly thickened, fasciculate, difform, hen- and there divided (flabella 



.ml of medial thickness, 25 35 •;. diam., usually toru- 

 times m< mingled with cylindric filaments, with pale brown contents, here 



and there dense brown; ultimate ramuli sometimes subclavate. [Figs. 94 — 96]. 



This species, 01 thered by Mr. Ridley in October 1904, and later by Mr. C. W. 



upon the surf-beaten coast of Christmas [sland, situated about 200 miles to 



iouth of lava, much resembles in external habit clumps of lul (nar pus spongiosus when dry 



They were erroneously referred by us (loc. cit.) to ./. lacerata 

 J. .\ I 1 we now find them to be quite distinct from that species in the si/c and character 

 of their frond-filaments. In - /. lacerata the frond-filaments are smaller and taper from a dia- 

 >f 25 u, where thickest, down to 5 \x at the apices, which are usually colourless. The 

 Christmas Island plants are quite different in habit and their filaments are usually torulose, 

 and are thicker and more uniform in size (25 — 35 jx), with brown, stout, sometimes sub-clavate 

 apia 95, 96 . The peculiar tufted habit of the Christmas Island plants recalls that of 



the rm of -•/. amadelpha, and, as in that form, is doubtless due to exposure to the 



h surf which beats upon the shores of the island. 



The nearest ally of A. Ridleyi is .1. clavatiramea, from which it differs entirely in 

 habit, and the somewhat smaller size of the usually torulose filaments which are less conspi- 

 cuously clavate. 



. Xvrainvillea canariensis n. sp. 



Syn. Udotea tomentosa Vickers in Ann. Sci. Nat. 8 e sér. tom. IV. [896. p. 300. 



Ha/'. ATLANTIC. Gran Canaria, Las Palmas, A. Vickers in Herb. Madame Weber !& in Herb. Bornet ! 



Plant brownish-green, about 12 cm. high, solitary, stipitate-, stipes 5 — 6 cm. long, simple, 

 compressed, expanding cuneately into the frond ; frond rotundate, large, 6 — 9 cm. long by 

 7 — 11 cm. wide. ver) obscurely zonate, thin, margin subentire to fimbriate or slightly lacerate ; 

 frond-filaments cylindrical, here and there torulose, not tapering nor clavate, green to fulvous- 

 brown, often collapsed and colourless when dry, coloured filaments usually 30 — 40 u diam. 



finding of this species was described by the late Mademoiselle Vickers (op. cit. 



"'sur Ie chemin de Telde, a 3 kilomètres de Las Palmas, il y a quelques 



sont pas trop mauvais. Je suis arriveé la un jour au moment ou 1'on tirait la 



population des environs y était assemblee, hommes, femmes et enfants. Pour eux 



re; moi, j'ai eu la chance de prendre possession de six beaux cxemplaires 



ipilia) tomentosa, ramenés par ces filets et laissés sur Ie sable par les pècheurs". 



vo of her specimens (one is shown in fig. 07) and are unable to refer 



n species, nor can we regard them as ncar allies of any other species. 



