BY A. tt. S. LUCAS. 59 



Chcetophora elegmis(\\ot\\.) Ag. In fresh- water stream, Proc- 

 tor's Road. 



Ghaetomorpha a«>ei?(Dillw.) Kuetz. Derwent, Thouin Bay. 



Cladophora pet lucid VfHuds.) Kuetz. Derwent. 



Cfiaccida Kuetz. Derwent. 



C. coTifervoides(Roih.) Le Jolis. Channel. 



Rhizoclonium tortuosum Kuetz. Derwent. 



Bryopsis hypnoides Lamour. Eaglehawk Neck. 



Canlerpa cactoides(Tum.) Ag. Near Actaeon I., in 20 fathoms. 



C 'odium bu?'sa(h.) Ag. 



C. galeatum J.Ag. Derwent. 



Probably many other Victorian seaweeds will also be found on 

 the other side of Bass Straits. 



Good fruiting examples, of Polysiphonia macrarthra Z&n., were 

 sent. Cystocarps numerous, lateral on median branches, sphaerico- 

 urceolate, on short stout pedicels consisting of one zone(articulus) 

 of siphons. Cystocarps 2-3 times as long as pedicel, with a 

 diameter shorter than that of the ramulus to which they are 

 attached. 



The following species of Ptilonia appears to be new. 

 Ptilonia intermedia, sp.nov. 



Fronde lineari ex ancipite plana, ad 30 cm. longa, decomposito- 

 pinnata. Caule initio fere tereti a hasi scutata mox ancipito 

 piano; ramis in ambitu ovalibus alternis axillis rotundatis bis vel 

 ter pinnatis, rachide ad 2 mm. lata; pinnulis planis, linearibus, 

 membranaceis, pinnellis paucis quasi dentiformibus e inargine 

 excurrentibus. Fronde stratis tribus contexta, costa fills articu- 

 latis ramosis longitudinal ibus, centrale distinctum ciugentibus, 

 cellis intermedii rotundato-angulatis majoribus, cellulis corti- 

 calibus parvulis radiatis. Cystocarpiis sphsericis parvulis, 300/x. 

 diametro, muticis, apparenter terminalibus ex apice pinnellae 

 praelongo evolutis. Color roseo-purpurea 



D'Entrecasteaux Channel, Tasmania; November, 1910 (L. 

 Rod way). 



With the typical structure of frond and cystocarps of the 

 genus, this graceful species, with the general habit of Delisea, 



