drying. The suhstance is rigid, and the plant scarcely adheres to paper in 

 drying. 



Under Plate X. of Vol. I. {Clirysymenia obovata), I have 

 quoted, from Professor J. Agardh, several synonyms, two of 

 which I now wish to transfer to the present Alga, which I sup- 

 pose may be the true " Bhabdonia (jloUfera " of Agardh. It 

 has externally a habit strikingly like some of the smaller and 

 denser specimens of Cli. obovata, but its cellular structure is 

 widely different ; and in this latter character it seems to agree 

 with the plant described by Agardh from the Paris Herbarium. 

 Whether that be the plant figured by Lamom'oux under the 

 name " Gigart'ina ovata" is uncertain ; his figure will serve for 

 either plant, and, of the two, bears a greater resemblance to 

 Bonder's Chrysymenia obovata than to the subject of the present 

 Plate. Thus much is certain : there are at least tivo plants 

 confounded under Rhabdouia globifera of Agardh. One of 

 them is CUrys. obovata, Sond. ! (our Plate X.) ; the other may be 

 wdiat is here figured, or if not, must be a closely aUied species of 

 similar structure and habit. 



My figure is drawn from a single specimen sent to me by 

 Mr. Clifton, and preserved in the Dubhn University Herbarium. 

 It seems to be of very rare occurrence, whereas Ch. obovata is 

 a very common plant both in Western Austraha and along the 

 south coast as far as Bass's Straits. 



The habit of B. globifera is peculiar in the genus Rhabdonia, 

 and in this respect it agrees better with Erythrocloniim., but it 

 wants the central axile filament characteristic of that genus. It 

 may perhaps be a matter for future decision whether the. genera 

 Areschougia, Rhabdonia, and Erythroclonium, ought not to be 

 united under a common name and character. Areschougia se- 

 doides (Plate CXVII.) and the present plant bring the three 

 groups almost together. 



rig. 1. Ehabdonia? globifera, — tlie natural size. 2. End of a yonng branch, 

 with whorled rarauli. 3. Cross section of a ramulus. 4. Semi-sectioa 

 across the stem : — the latter figures variously rnagnijied. 



