89 DR. С. $. WEST ON THE ALGJE OF 
Class FLAGELLATA. 
Family ОТМОВВУАСЕЖ. 
Genus DINOBRYON, Ehrenb. 
68. DINOBRYON ELEGANTISSIMUM, sp. п. (Text-fig. 10, К.) 
Membrana evaeuata firma et hyalina; parte mediana ellipsoidea, parte 
superiore producta et angustiore, colliformi cum osculo expanso ad apicem, 
parte inferiore acute conica et in stipitem tenuem elongatum producta, cum 
basin stipitis expansa. 
Long. (sine stip.) 34 w; long. stip. 28 ш; lat. max. 13 р; lat. coll. 4 р; 
lat. oseul. 775 д. 
Hab. Yan Yean Reservoir, at the weedy margin (Jan. 1906); very rare. 
Only two empty tests of this species were observed. Tt is distinguished by 
its elegance of outline, by its rather narrow neck with an expanded mouth, 
and by its elongated stalk. The stalk possesses a slight basal dise for attach- 
ment, from which one would conclude that the individuals are solitary. In 
the two specimens seen no traces of the cell-contents were present, and for 
this reason I am rather doubtful about the correct inclusion of this organism 
in the genus Dinohryon, 
VI. THE PECULIARITIES OF THE AUSTRALASIAN ALGA-FLORA. 
As I have previously pointed out*, no group of the freshwater Algæ 
exhibits such marked geographical peculiarities as the Desmidiaceæ. Some 
of the subaerial Algæ, such as many species of Trentepohlia, Cephaleuros, 
Phyllosiphon, of the Seytonemaceæ, Nostocaceæ, ete., are restricted to certain 
regions, but, apart from indefinite limitations to tropical or temperate zones, 
their distribution is rather a question of atmospheric conditions than of 
geographical situation. Most of the Oedogoniaceæ, Ulotrichaceæ, Clado- 
phoraceæ, Zygnemaceæ, and Protococeace are more or less world-wide as 
either temperate or tropical species, or as both : and there is no reason to 
suppose that the new species of these groups described in the present paper 
(Ulothrix idiospora, Debarya Hardyi, Mougeotia rictoriensis, ete.) are restricted 
to Australia. It is more than probable that they will be found in New 
Zealand, in various islands of the Pacific, in the East Indian Archipelago, and 
parts of Eastern Asia, and not unlikely in Central and South Africa and 
South America. 
ж С. $. West in Journ. Linn. Soc., Bot. xxxviii, (1907) p. 82; W. & G. В. West in Ann. 
toy. Bot. Gard. Calcutta, vol. vi. (1907) p. 176. 
