94 BIOLOGY OF THE RICHMOND RIVEB, 



Samples.— ^os.l-3, 5, 6, 8, 11-13, 15-18, 20-22* are from squeez- 

 ings of weeds, chiefly out of the river at Lismore, two or three 

 out of tributary creeks. Nos. 7 and 9 are silk-net gatherings, 

 also from the river at Lismore. No. 14 out of weeds and Hydro- 

 dictyon reticulatum from the river at Casino. Nos. 24 and 33, 

 mucilaginous gouts from an open drain in Keen Street, river- 

 water. Nos. 25 and 26, mucous strata on the footpath near the 

 Commercial Hotel, caused by a leaky fire-hydrant, river-water. 

 Nos. 27-29, 39 and 40, mucous strata from the river-brink at 

 Coraki. Nos. 30 and 34, scrapings from the basin of the horse- 

 trough near the Gov. Savings Bank, river-water. No. 41 from 

 weeds out of a tributary creek at Kyogle, running water. This 

 last, a very small gathering, is remarkable for the number of 

 forms contained in it, especially Desmids, which do not take 

 kindly to running water. 



Character of the Flora and Fauna. — The outstanding feature 

 of the Richmond River flora is undoubtedly its richness in 

 diatoms, of which it forms almost a synopsis of the district. Of 

 147 forms noted in the latter, from Kyogle to Bexhill, 132 occur 

 in the river-system, belonging to 75 generally recognised species. 

 It is not surprising, therefore, to find also a considerable number 

 of the MyxophycecE, as these two groups generally flourish together. 

 Of seven species of the latter, the principal source was indeed on 

 land, in situations (horse-trough, foot washer, fire-hydrant, or open 

 drain) supplied by river-water, but of these seven, four were also 

 noted in the river itself. 



The following tables show the relative proportions of the con- 

 stituents of the Flora and Fauna of the Richmond River, com- 

 pared with those of the Nepean River (Sydney water), Yan Yean 

 Reservoir, Melbourne, the Central African Lakes, and the Lochs 

 of the West of Scotland, as far as they have been noted. f 



* For convenience, the local numbers 1-41 have been used in these notes; 

 they correspond to Nos. 176-216, inclusive, in the National Herbarium, 

 Sydney, where the originals are deposited. 



t Cf . These Proceedings, Vol. xxxvii., 1912; Journ. Linn. See. Bot., Vol. 

 xxxix., 1909; ibid., Vol. xxxviii., 1907; Trans. Roy. Irish Acad., Vol. 

 xxxiii., 1906, respectively. 



