OF SOUTH AUSTRALIA. 
403 
VIII. CONJUGATES. 
Cells solitary or in chains. Characterized by lack of flagellated reproduc- 
tive cells, and sexual reproduction by means of amoeboid gametes. All are 
fresh- water forms. 
IX. CHLOROCOCCALES. 
Cells solitary or colonial, with either a definite or indefinite number of 
cells in a non-filament ous colony. Vegetative cell division does not occur. 
Nearly all species are fresh-water inhabitants, many forming the plankton 
of ponds and lakes. 
X. SIPHONALES. 
Unicellular, multinucleate (coenocytic) algae in which the cell is 
generally a branched tube capable of indefinite elongation. Cytoplasm lines 
the wall and bounds a continuous central vacuole. Within the cytoplasm 
are situated many discoid chloroplasts and numerous nuclei. Asexual 
reproduction by fragmentation of the thallus; sexual by isogamous, aniso- 
gamous, or oogamous gametes. Most of the genera are marine, and are 
found in tropical or subtropical seas. South Australian representatives 
belong to three families : 
1. Family Bryopsidaceae. — Thallus unseptate and differentiated into a 
prostrate rhizome-like portion and an erect pinnately branched portion. 
Bryopsis Lamouroux. 
B. plumma (Huds.) C. Agardh. Encounter Bay, Investigator 
Strait, Eastern Bays. 
B. vestita J. Agardh. Eastern Bays. 
2. Family Caulerpaceae. — Thallus one-celled w T ith a rhizome-like portion 
bearing root-like appendages on its lower face and erect shoot-like 
■appendages on its upper face. The family includes but one genus. 
C aider pa Lamouroux. 
C. scalpelliformis (R. Br.) C. Agardh. Encounter Bay, Eastern 
Bays. 
C. longifolia C. Agardh. Encounter Bay, Investigator Strait. 
C. Ilarveyi F. von Mueller. Investigator Strait, Eastern Bays, 
Encounter Bay. 
C. Cliftoni Harvey. Encounter Bay, Investigator Strait. 
C. obscura Sonder. Holdfast Bay, Encounter Bay, Investigator 
Strait, Eastern Bays. 
6. trifaria Harvey. Holdfast Bay, Encounter Bay, Eastern Bays. 
C. Brownii Endlicher. Encounter Bay, Investigator Strait, 
Eastern Bays, Great Australian Bight. 
C. Hedleyi. W. van Bosse. Off Kangaroo Island. 
C. hypnoides (R. Br.) C. Agardh. Encounter Bay, Investigator 
Strait, Eastern Bays. 
C. Muelleri Sonder. Doubtfully distinct from C. hypnoides. 
Similar localities. 
