Adams — A List of Synonyms of Irish Algae. 187 



VI. — Chlorophyoeae — continued. 

 Ulva 



crispa Light/. - Prasiola crispa Menegh. 



furfuracea Horn. = Prasiola furfuracea Menegh. 



incrassata Huds. - Chaetophora Cornu-Damae Ag. 

 Vaucheria 



caespitosa Ag. = V. geminata D. G. 



racemosa Walz. = V. geminata D. C. 



sericea Lyngh. = V. ornithocephala Ag. 

 Volvox 



globator Ehr. = V. aureus Ehr. 



YII. — Rhodophyceae. 



Batrachospermum 



atrum Both. = B. Dillenii Bory. 

 Conferva 



atra Dilho. = Batrachospermum Dillenii Bory. 

 Lemanea 



fluviatilis Bory. = Saclieria fiuviatilis Sirocl. 



B. MARINE SPECIES. 



I. — Diatomaceae. 



Actinocyclus 



undulatus Bail. = Actiuoptycbus undulatus Balfs. 

 Actinoptychus 



senarius Ehr. = A. undulatus Balfs. 

 Amphipleura 



sigmoidea W. Svi. = Nitzschia Sigma W. Sm. 

 Amphiprora 



constricta Ehr. = Navicula simulans Donk. 



didyma W. Sm. = Donkinia sp. 



elegans W, Sm. = Plagiotropis elegans Grun. 



pusilla G-re(/. = A. lepidoptera Greg. 



vitrea W. Sm. = Plagiotropis vitrea Grun. 

 Amphitetras 



antediluviana Ehr, =Biddulphia antediluviana H. V. H. 

 Amphora 



dubia Grey. = A. arenaria Donk. 



granulata Greg. = A. lineata Greg. 



lyrata Ch'eg. = A. angularis Greg. 



nana Greg. = A. elliptica Kiitz. 



proboscidea Greg. = A. commutata Grun. 



