ALGOLOGICAL NOTES 85 



(Kiitz.) Kabenh., E. lunaris (Ehrenb.) Grun., E. flexuosa Klitz., 

 Desmagonium Bahenhorstianum Grun. 



Achnanthes cremdata Grun., A. hungarica Grun., Cocconeis 

 Placentula Ehrenb. 



Navimda appendictdata (Ag.) Kiitz., N. gracilis (Ehrenb.) Kiitz., 

 N. major Kiitz., N. nobilis Ehrenb. var. Dactylus (Ehrenb.) V. H., 

 N. stauroptera Grun., N. viridis Kiitz., N. viridida Kiitz., Stauroneis 

 Phosnicenteron Ehrenb., Vanheurckia rhomboides (Ehrenb.) Breb. 

 var. saxonica (Eabenh.) G. S. West. 



Gomphonema gracile Ehrenb. and varieties, G. teneUum Kiitz., 

 G. parvidum Kiitz. 



Cocconema cymbiforme Ehrenb., C. Iceve (Nag.) G. S. West, 

 C. leptoceros Ehrenb., C. turgida (Greg.) G. S. West, C. ventricosa 

 (Kiitz.) G. S. West. 



Bhopalodia gibberula (Kiitz.) O. Miill. 



Nitzschia scalaris (Ehrenb.) W. Sm., N. Sigma W. Sm., var. 



SurireUa biseriata Breb., S. linearis W. Sm. and varieties, 

 S. ovalis Breb. var. angusta (Kiitz.) V. H. 



Of the various species recorded in the above Hst the following 

 deserve special mention : — 



Cylindrocystis pyramidata W. & G. S. West. This species 

 is known to occur in Ceylon and Burma. It still requires de- 

 tailed investigation as to the nature of its cell- wall, as the conju- 

 gation rather leads one to suppose that it would be more correctly 

 placed in the genus Cosmarium, in which case a good name for 

 it would be "Cosmarium cylindrocystiforme." Long. 31-33 /x; 

 lat. 20-22 IX. 



Cosmarium subtriordinatum W. & G. S. West var. rotun- 

 datum Schmidle in Engler's Botan. Jahrbiich. xxvi. 1898, p. 36, 

 t. 2, f. 20, 21. The specimens seen from the small stream at 

 Mosman were very like Schmidle's fig. 21 in outline, but in all 

 cases the granules were as acute as in the type form. The variety 

 differs markedly from the type, however, in its open sinus and 

 more elliptic semicells. Long. 27 /x ; lat. 28 /x ; lat. isthm. 10 /x; 

 crass. 17 /x. 



Cosmarium subspeciosum Nordst. var. simplex var. n. Var. 

 crenis nudis, tumore basali semicellularum glabro sed rotundato 

 ut in forma typica. Long. 40 /x ; lat. 34 /x ; lat. isthm. 11 /x ; 

 crass. 22 /x. 



Hab. Backwater on Big Mosman Eiver, N. Queensland. 



This variety is characterized by the entire absence of granules 

 from all the lateral crenations and from the basal tumour of the 

 semicells, but is otherwise similar to the typical form. It bears 

 the same relation to the granulate forms of C. sicbspeciosiim as 

 does C. speciosum var. simplex Nordst. to the more typical forms 

 of C. speciosum. 



Euastrum ansatum Ralfs. Two forms of this ubiquitous 

 species were observed : — 



a. Forma minor, marginibus lateralibus retusioribus ; long. 



