OF THE ' CHALLENGER ' EXPEDITION. 241 



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IV. Algce collected by Mr. Moseley from the Surface of the Sea 

 among drift wood 70 miles north-east of the Ambernich Hirer, 



New Guinea. 



FVCACKS. 



Sargassum gracile, J. Ag.l 



The specimens very imperfect, and therefore doubtful. 



TURBINARIA VULGARIS, /. Aff. 



V. Algce collected by Mr. Moseley off Raoul Island. 



FUCACE^E. 



Cystophora elongata, n. sp. 



Caule compresso piano, decomposito-piunato, pinnis distich is, alternis, 

 a margine egredientibus ; pinnulis ultimis in rachi costata alternis, 

 subsessilibus, lanceolatis, acutis ; vesiculis subsessilibus magnis, ellip- 

 soideis, apicibus acutis vel breviter apiculatis. 



Mr. Moseley 's specimens are 2 to 3 feet, or more, in length. 

 The plant is allied to C. platylobium, Mert., but has a broader and 

 much compressed stem : there are no costae ; the pinnules are lan- 

 ceolate and much attenuated towards the base and apex ; in O. 

 platylobium the vesicles are spherical, and about the size of the 

 fruit of I*runus spinosa ; in the new species they are elliptic and 

 an inch or more in length. " The specimens (a few bunches only, 

 and infested with marine Crustacea &c.) were found floating thirty 

 miles distant from Raoul Island, Kermadecs." 



VI. Algce collected by Mr. Moseley at the Aru Islands. 



FlJCACEiE. 



Sargassum dentifolium, Turner! 



Specimens very imperfect, and therefore recorded with doubt 

 Turbinaria vulgaris, J. Ag. 



HORMOPHYSA ARTICULATA, Ktz. 



DlCXYOXACEJS. 



Pa bin a Pavonia, L. 



Dictyota dichotoma, Huds. 



A narrow variety. 



Hydroclathrus cancellatub, Bory. 



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