PREFATORY NOTICE. 
—_ 
TuE present Bulletin is a continuation of Botany Bulletin No. VI., 
issued in January, 1893, and concerns the same order of plants. The 
determinations have all been made by my esteemed correspondents, 
the eminent specialists Professors Askenasy and Moebius, except in 
one or two cases of doubt, in which they referred to Professors 
Nordstedt and De Toni; and the material collected from different 
parts of the colony was forwarded to Professor Askenasy by myself. 
The descriptions are mostly derived from publications in German by 
the two first-mentioned gentlemen, and have been translated for me by 
my friend Mr. W. J. Byram, who is bimself a worker in this order 
of plants. The illustrations of the freshwater forms are from the 
pencil of Professor Moebius, who kindly forwarded them for repro- 
duction in the present Bulletin ; whilst those-of the saltwater forms 
are derived from photo-micrographs taken by Professor Askenasy. 
I have also, for the sake-of comparison, in most cases added descrip- 
tions from the works of Cooke and Wolle, and wherever I have used 
these authorities it will be found that I have recorded my obligation 
tothem. It must, however, be remembered that the descriptions of 
Professors Moebius and Askenasy are taken from the Queensland 
plants themselves, and are, therefore, for this colony always the most 
reliable, 
T cannot allow this opportunity to pass without expressing my 
very deep sense of the courtesy and kindness displayed by Professors 
Moebius and Askenasy in undertaking these investigations, and my 
thanks for the trouble and time which they have expended in 
supplying descriptions and illustrations. I have also to express the 
hope that the study of microscopy in this colony will be materially 
advanced by this valuable accession to our knowledge of its Alge, 
and that not only may a delightful pursuit be provided for lovers 
the beautiful, but that important additions may be made to biologica 
Science, . 
: F.M.B. 
July, 1895. 
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