180 Proceedings of the Royal Irish Academy. 



IV. — Desmidiaceae — continued. 

 Euastxum 



scitam West. = Cosmarium nasntum Nordst. 



spinosum Ealfs. =E. elegans Kiitz. 

 Gloeoprinm 



dissiliens Berk. = Hyalotheca dissiliens Breb. 



mucosum Birk. = Hyalotheca mucosa Ehr. 

 Gonatozygon 



Biebissonii De Bary. = G. aspernm Cleve. 



laeve HUse. = G. asperum CUve. 



minuttun West. = G. asperuin Cleve. 



Ralfsii De Bary. = G. monotaenium De Bary. 

 Leptocystinema 



aspernm Arch. = Gouatozygou asperum Cleve. 



Km&h&ni Arch. = Gonatozygon Kinabani Rabh. 



Portii Arch. = Gonatozygon asperum Cleve. 

 Mesotaeniom 



Braunii De Bary. = M. macrococcum Roy. <t Biss. 



micrococcum Kirchn. = M. macrococcum Roy. £ Biss. 

 Micrasterias 



angulosa Hant^sch. = M. denticulata Rolfs. 



brachyptera Lund. = M. apiculata Menegh. 



fimbriata Rolfs. = M. apiculata Menegh. 



furcata Ag. = M. rotata Ralfs. 



mucronata Rabh. = M. oscitans Ralfs. 



radiosa Ralf$. = M. Sol. KiiU. 

 Onychonema 



filiforme Roy. d Biss. = 0. nordstedtiana Turn. 

 Palmella 



protaberans Ag. = Mesotaeniom macrococum Roy. <£ Biss. 

 Peniom 



Berginii Arch. = P. Navicula Breb. 



Brebissonii Menegh. = Cylindrocystis Brebissonii Menegh. 



closterioides Ralfs. = P. Libellula Nordst. 



Digitus Brib. = Netrium Digitus ItiUjs. £ Rotlie. 



interruptum Breb. = Netrium interruptum LUtkem. 



lamellosum Breb. = Netrium Digitus Itzigs. £ Rothe. 



Naegelii Breb. = Netrium Naegelii W. £ G. S. West. 



oblongum De Bary. = Netrium oblongum Liitkem. 



rufopellitum Roy. = P. rufescens Cleve. 

 Plenrotaenium 



clavatuui De Bary. = P. Trabecula XOg. 



