106 BIOLOGY OF THE RICHMOND RIVER, 



gives "long. 18-20/x, cellules oblongues." Ch. intermedia is the 

 prevailing form of the genus in this country. In small two- 

 celled coenobia, the cells are always disposed head to tail. If by 

 nothing else, immature forms can generally be recognised by the 

 presence of a minute clear spot at one extreme end. 



Chlamydomonas globulosa Perty. (PI. ii., f.l^, 



Diam. cell. 14-16, cell, matric. 26, aplanop. 12 /x. 



Lismore (21). 



Chi. globulosa (rare) and Chi. Steinii Gorosh.,(very rare) are the 

 only other species that I have met with in New South Wales. 

 Chlamydomonas could only be said to just occur in the river; it 

 is noteworthy that neither Gleocystis vesiculosa nor Sphcerocystis 

 Schrciteri were present. I consider them to be its vegetative stages. 



The gathering (14) from Casino having been kept for some 

 months, two minute Chlamydomo7ias forms developed in some 

 quantity. They w^ere non-motile when observed, without flagella 

 or stigma, but in the larger (12x7) a contractile vesicle was 

 working. They denote, I fancy, the presence of Chi. intermedia. 

 (PI. ii., f.l4, 15). 



Genus VoLVOX (L.) Ehr. 

 VoLvox aureus Ehr. (PI. ii., f.2-4). 

 CcEn. matric. diam. 300, membr. crass. 3; cell. diam. 8; parthe- 

 nog.(8) diam. 45-50 fx. 

 Lismore (20). Rare. 



The cells were globose, the connecting strands quite plain, 

 generally single, but sometimes geminate. 



VoLvox Bernardii mihi. (PI. ii., f.5-11}. 



Forma V.aureo similis, nuUis autem fills cellulis conjungentibus. 

 Coenobii membrana plerumque crassa. 



Ca?n. matric. diam. 290-300, membr. crass. 3-6; cellulis pyri- 

 formibus vel globosis (ambitu circa 28) diam, 4-8, inter se dis- 

 tantibus 20-30. Ccenob. filial. (8-12) diam. 60-96, cell. diam. 2-4, 

 inter se distant. 1 diam., parthenogonidiis (8-12) diam. 12-40/x. 



Many young specimens were noted, evidently not long freed 

 from the mother ccenobium; their specifications were : — 



