192 Proceedings of the Royal Irish Academy. 



I. — DiATOMACEAE — contitvued. 

 Scoliopleura 



convesa W. Sm. = S. latestriata Grim. 

 Jennerii W. Sm. = S. tumida Babh. 

 Stauroneis 



ampbioxus Crreg. = Stauroneis Gregoryi Balfs. 

 crucicula W. Sm. = Navicula crucicula Donk. 

 pulchella W. Sm. = Navicula aspera Ehr. 

 Striatella 



arcuata Ag. = Ehabdonema arcuatum Eiitz. 

 Surirella 



constricta W. Sm. = S. Smithii Ealfs. 

 craticula Ehr. = Navicula sp. 

 Synedra 



Frauenfeldii Qrun. = Thalassiothris Frauenfeldii Grun. 

 gracilis Kiltz. = S. aflinis Kiitz. 

 tabulata Ag. = S. affinis Kiitz. 

 Tessella 



catena Ehr. = Rhabdonema arcuatum Kiitz. 

 iuterrupta Ehr. = Striatella interrupta Heib. 

 Tbalassiotbrix 



curvata Castr. = Synedra nitzschioides Grim. 

 Triceratium 



alternans Bail. = Biddulphia altemans H. Van Hcjirck. 

 favus Ehr. = Biddulphia favus E. Van Eeu/rck. 

 Tryblionella 



acuminata W. Sm. = Nitzscbia acuminata Gnm. 

 apiculata Greg. = Nitzscbia apiculata Gnm. 

 constricta Greg. = Nitzscbia constricta Grun. 

 marginata W. Sm. = Nitzscbia navicularis Grun. 

 Neptuni Schum. = Nitzscbia punctata Grun. 

 punctata IF. Sm. = Nitzscbia punctata Gnm. 

 scutellum W. Sm. - Nitzscbia circumsuta Grun. 



II.— Cyanophyceae. 

 Calotbrix 



caespitula Harv. = Hydrocoleus comoides Gom. 

 hydnoides Harv. = C. pulvinata Ag. 

 luteola Grev. = Lyngbya luteola Crouan. 

 paunosa Ag. = Lyngbya aestuarii Licbm. 

 semiplena Harv. = Symploca hydnoides Kiitz. 



