OF SOUTH AUSTRALIA. 
25 
CHAETOMORPHA Kuetzing. 
Filaments quite simple, each with its own attachment, a small disc or 
rhizoids, growing gregariously in tufts. Little is known of the reproduction 
and the so-called species have been defined by the dimensions and shape 
of the component cells. Since there is much divergence in these respects 
in almost any clump observed, even in the apparently adult filaments, an 
exact nomenclature is hardly possible. We may, however, distinguish the 
more outstanding forms likely to be met with on the South Australian 
coast as follows: — 
C. Darwinii : Cells of the chain large, globular, about as broad as 
long, separated by narrow constrictions. Diameter, 1,000 ^ to 
2,000 fx. 
Fig. 8 .— Ch aetomorpha Darwinii. 
