96 BIOLOGY OF THE RICHMOND RIVER, 



cipally swamp-dwellers, but considering that almost all the 

 gatherings were shaken out of weeds, the extremely poor repre- 

 sentation of Staurastnini is surprising. In the main gatherings 

 only three species were noted, St. retiisum Turn., St. striolatum 

 Niig., and another: the other two, in an isolated sample from 

 Kyogle, were St. ddatatumxsiY. obtusilobum De Not., and another 

 (unidentified). Of the long-rayed forms, not a trace was to be 

 found, nor were there present any of the variations of St. orbicu- 

 larcy so common in the Nepean water. Euastrum was also con- 

 spicuously absent, two specimens only (of Eu. binale i.) having 

 been noted in a net-gathering. 



Chlorophycecp. — These total up well, but in the fresh gather- 

 ings they were very poorly represented indeed, both in species 

 and in numbers. Spirogyra maxima was plentiful at Lismore, 

 and Hydrodictyon reticidatum was found in great abundance, 

 covering the surface of the river, at Casino, but the commonest 

 forms of ProtococcoidefT. had to be diligently sought for. All the 

 usual members of the Chlorophycecp were represented, however, 

 the same genera almost exactly as in the Sydney Water with the 

 exception of Nephrocytium, Oocyst is, Eremosphcera, Botryococcus 

 and Ineffigiata. As these are found here in swamps and 

 lagoons, their presence in the Nepean water would seem to 

 indicate some infiltration from a similar source. All five, but 

 especially the last two, get the credit of being plankton-algse, but 

 all my observations of their occurrence go to show that their 

 home is in swamps and lagoons. 



With regard to the Fauna, the Peridiniece and Dinobryon 

 have already been mentioned; there was a good array of Rota- 

 toi'ia; the Rhizopoda were plentiful and in fair variety. Of the 

 Infusoria, the flagellates Euglena, Phacus, Lepocinclis and 

 Trachelomonas were almost entirely wanting, MaUomonas and 

 Synnra altogether so. But then the swamps and lagoons of the 

 district seem to be quite separate from the river-system. 



The number of organisms noted in the Richmond River and 

 creeks amounted to Flora 305, Fauna 93, total 398. Of these, 

 81 and H respectively are here described as, to a greater or less 

 extent, new forms. They are allocated thus -.—Chlorophycece 18, 



