WEBER-VAN BOSSE—MARINE ALGAE 287 
6. LAURENCIA CEYLANICA, J. Ag. 
J. Agardh, Epicrisis Syst. 1876, p. 660. 
De Toni, Syll. Alg. vol. iv. sect. 111. 1903, p. 805. 
Amirante, at 20 fms.; dried specimen and in alcohol. 
Coetivy, reef; in alcohol. 
Distribution. Ceylon. 
Subfam. CHONDRIES. 
AcANTHOPHORA, Lamouroux. 
1. ACANTHOPHORA ORIENTALIS, J. Ag. 
J. Agardh, Species Algarum, ii. 1863, p. 820. 
De Toni, Syll. Alg. vol. iv. sect. m1. 1903, p. 822. 
Borgesen, “Some new or little-known West Indian Floridee, 11.,” in Bot. Tidsskr. Bd. xxx. 
1910, p. 201. 
Mahé, Cap Terné; dry specimen. 
Seychelles, Long Island; dry specimen. 
Distribution. Zanzibar; Malay Archipelago; North Australia; Tonga Archipelago ; 
Marianne Islands. 
Both specimens are full grown and large, but both are barren, and thus a study of 
the stichidia is out of the question. Ina recent paper Mr. Borgesen has called atten- 
tion to the fact that the name of A. Thierii ought to be changed to A. spicifera and that 
the antheridia of A. orientalis are very much like those of A. spicifera. 
PSEUDENDOSIPHONIA, 0. g. 
Thallus radicibus parvis substrato affixus et verisimiliter horizontaliter expansus, 
constat ex axi principali, ramis lateralibus incremento infinito et ramis dorsalibus 
ventralibusque incremento finito. Ad apicem vegetationis axis principalis radiatim 
se findit ; axis principalis postea etiam inferius bilateralis. Axes laterales eodem 
modo quo axis principalis nascuntur. Thallus formatus e cellula centrali et quatuor 
cellulis pericentralibus pluribus stratis cellularum corticalium peripheriam versus 
diminutarum cinctis. Cystocarpia et antheridia ignota. Stichidia in apice 
pedicelli monosiphonii, sporam unam in singulis segmentis continentia. Pedicellus 
monosiphonius ramificatus; stichidia nuda. 
1. PSEUDENDOSIPHONIA GARDINERT, n. sp. (Plate 17. figs. 13-15; Plate 18. fig. 30.) 
Stichidiis sparsis extra axillaribus; ceteroque confer diagnosin generis. 
Amirante, 20-25 fms.; in alcohol. 
Pseudendosiphonia Gardineri recalls, by its short thorny branches and its stichidia 
borne on a monosiphonous stalk, the genus Hndosiphonia. It has, however, a different 
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