THE YAN YEAN RESERVOIR, VICTORIA. 23 
MONTHLY STATEMENT OF THE МІСКОРНҮТІС BENTHOS FROM 
Fes. 1905 ro JAN. 1906. 
Feb. Ath, 1905.—Desmids dominant, with few Myxophyceæ and Diatoms. 
The Protocoecoidez were only represented by a few specimens of Pediastrum 
Tetras. 
Mar. Ath, 1905.—Desmids dominant, mostly small species. Zygospores 
of Cosmarium contractum not uncommon. А species of Chytridium was 
abundant, parasitic on certain species of Cosmarium. A decided increase 
in the number of Protococcoideæ. 
April 1st, 1905.— Desmids dominant, having reached their maximum 
abundance. The most conspicuous species were Cosmarium obsoletum and 
Staurastrum senarium, Diatoms numerous. А species of Anabena occurred 
and showed indications of spore-formation. Sterile species of Mougeotia not 
uncommon. 
May 6th, 1905.—Desmids still dominant, but great diminution in the bulk 
of the material. Much decomposition had taken place, and the material 
consisted largely of decaying organic matter. The Anabena sp. was still 
evident, but the filaments were in a very fragmentary condition. 
June 3rd, 1905.—Desmids very abundant, especially Cosmarium contractum 
and its var. ellipsoideum, Staurastrum muticum, S. corniculatum, ©. leptacan- 
thum, and S. victoriense. Diatoms few as regards individuals, but 20 species 
represented. 
July 1st, 1905.—Desmids dominant and most of them in a state of active 
division. The most conspicuous were Staurastrum cuspidatum, S. muticum, 
S. victoriense, S. assurgens, and Cosmarium contractum var. ellipsoideum. 
The Myxophyce: were represented by quantities of Oscillatoria Agardhii and 
somewhat fragmentary filaments of the same species of Anabena as occurred 
in April and May. Number of Diatoms increased, more especially due to the 
multitude of individuals of some of the smaller species. 
Aug. 5th, 1905.—Desmids practically disappeared; only living ones were 
Closterium Venus, Staurastrum cuspidatum, and S. sagittarium, all of which 
were very scarce. Various dead and half-decayed remains of numerous 
species were conspicuous. The other Chlorophyceæ have also disappeared. 
One solitary Volvox colony was seen. Diatoms more numerous and more 
conspicuous ; especially noticeable were the large individuals of Æunotia 
major var. bidens. А few Crustacea were present, and also a Tardigrade 
(a small sp. of Macrobiotus). 
Sept. 2nd, 1905.—No Chlorophyceæ observed. Fewer Diatoms than im 
preceding month, both of species and individuals. Rather more of the small 
Crustacea than in August. 
