199 
Euastrum elegans (Bréb.) Ktz. 
Micrasterias laticeps mihi (S- 
* — didymacantha (Nag.). 
— Crux melitensis (Ehrb.) Ralfs. 
— furcata Ralfs. 
* — foliacea Bailey. 
— truncata (Corda) Bréb. 
— rotata (Grev.) Ralfs. 
* — radiosa Ralfs 
* Staurastrum orbiculare (Ehrb.) Ralfs. 
— aristiferum Ralfs. 
* — margaritaceum (Ehrb.) Menegh 
— tetracerum Ralfs. 
* — polgmorphum Bréb. 
— gracile Ralfs. 
Xanthidium fasciculatum Ehrb. 
Arthrodesmus Incus (Bréb.) Hass. 
* — convergens Ehrb. 
* — subulatus Ktz. 
Nonnisi unum genus, Onychonema^ nec in America boreali 
nec in Europa adest, sed in Bengalia inferiori, ubi tamen diver- 
sam speciem offert. 
Operum, quæ in hoc opusculo citavi, hæc ipse vidi et consului: 
Agardh, C. A. Systema Algarum. Lundæ 1824 (Ag. Syst. Alg.). 
— Neue Gattungen und Arten von Algen; Flora oder Botanische Zeitung, 
lOter Jahrg , 2ter Bd., 1827 (Ag. Flora). 
Archer, W. Supplementary catalogue of Desmidiaceæ found in the neigh- 
bourghood of Dublin; Proceedings of the Dublin University Association 
Vol. 1, part. 1, 1858. (Archer Proc. Dubl.). 
— Description of a New Species of Micrasterias; The Dublin Quarterly 
Journal of Science. Vol. 11. London 1862. (Archer Descrip. 1862). 
Bailey, J. W. American Bacillaria, part. I, Desmidiaceæ; American Journal 
of Science and Arts, Vol. XLI, Nr. 2. (Bailey Desm.). 
— Microscopical Observations made in South Garolina, Georgia and Florida; 
