140 BIOLOGY OF THE RICHMOND RIVER, 



Yar. MAXIMA, n.var, (PL vii., f.ll). 



Diam. 8 /x. Lismore (2), rarissime. 

 Var. ASPERA, n.var. (PI. vii., f.l2). 



Fila dilutissime caerulea vel achroa, minute aspera, granulis 

 atris sparsis projicientibus, diam. 1-2 /x. 



Casino (14). Plentiful. 



Geddes and Ewart, Z.c, have shown, though not by name, that 

 Oscillatorui amphibia is the sporangial state of Spirillujn. It is 

 developed from the same filamentous form which gives rise to 

 Spirillum volutans and *S';->. tenue. The scattered granules, at 

 first hyaline, and later deep black, are loculi full of spores, which 

 are set free and develop into Sp. undula. These three Spirilla 

 are, of course, merely polymorphic forms, one of the other. In 

 var. aspera, the granules project through the cell-wall. 



Bacillus subtilis. (PI. vii., f.l3). 



Fila diam. 1-2 (vulgo IJ); cell. alt. 5-10, vel. 10-22 /x. 



Lismore (6, 7, 20), Casino (14), Kyogle (41, 45). 



Was more in evidence in these gatherings than I have ever 

 known it before. The cells, in the filaments, are generally dis- 

 jointed, but in (41) short filaments were noted with contiguous 

 cells. Bacterium termo and Vibrio serpens were also met with. 

 Two curious zoogloea stages of the former are figured(Pl.vii.,f.l4). 



Fauna. 

 ENTOMOSTRACA. 



Macrothrix spinosa King. (PI. viii., f.l). 



Long, carap. 530, lat. 330; long. caud. proc. 142, set. 124; long, 

 antenn. 105; spin, ad 70 /x. 



Lismore (11, 12, 13, 15), Casino (14). 



Common in the river. The caudal processes often end abruptly, 

 each terminating in a pair of long setae. Noted with winter eggs 

 in December and January (midsummer). Dorsal edge of the 

 carapace minutely serrulate. It is doubtful, therefore, whether 

 the species is distinct from M. latico7^nis (J urine), as Sars( Austral. 

 Cladocera, ii., p. 26) makes this the chief point of difference. 



