Adams — .1 List of Synonyms of Irish Algae. 211 



[Rabh.), G. regularis W. & G. S. West, Ineffigiata neglecta W. & G. S. West, 

 Miciospora vulgaris Rahli., Norclstedtia globosa Borzi, Oocystis setigera Arch., 

 Palmella botiyoides Kiitx., rediastrimi angulosum Ehr., V. pertusum Kiits., 

 Pleurococcus rufesceus Brih., Protococcus infusionum Kirchn., P. viridis Ay., 

 Ehaphidium convolutuni Bctbh., E. polymorphum Fresen., Scenedesmus acutus 

 Meyen, S. alteruans Eciiisck, Sphaerella nivalis Sommcrf., Spondylomorum 

 quaternatum Ehr., Tetrastruin heteracanthum Cliod., Tribonema abbieviatum 

 (Babh.), T. pachydermum {Willc), T. Eaciborskii {Gutiv.), T. stagnorum Kiitz., 

 Ulothrix bieolor Balfs., U. radicans Kutz. 



(h) The following should be regarded as doubtful species : — Conferva 

 polita Harv., Microspora punctalis Rahh. 



(c) Microspora abbreviata Bahh. should be M. abbreviata Lagerh. 



Marine Diatojiaceae. 



(CI.) The following species should be deleted : — Amphiprora paludosa 

 W. Sm., A. ovalis Kiitz., Campylosira eymbelliformis Gi^un., Coscinodiscus 

 subtilis Grim., Dimeregramma fulvum Balfs., Fragilaria virescens Balfs., 

 Hyalodiscus subtilis Bail., Mastogloia Grevillei W. Sm., M. Smithii Thw., 

 Navicula abrupta Greg., 'N. amphisbaena Bori/, N. constricta Gi'un., N. 

 cryptocephala Kutz., IST. elliptica W. Sm., K forcipata G^'ev., N. lanceolata 

 Kiitz., ISr. rostrata Ehr., Nitzschia affinis Kiitz., N. Tryblionella Hantzsch, 

 Orthotropis lepidoptera Cleve, 0. maxima Greg., Plagiogramma Gregorianum 

 Gi-ev., Surirella craticula Ehr., S. ovalis Breb., Synedra frauenfeldii &)-un., 

 S. Ulna Ehr. 



(6) Xavicula distans H. van Heurek should be N. distans Balfs., N. ramo- 

 sissimum A<j. should be N. ramosissima Ay., Pleurosigma strigilis W. Sm. 

 should be P. strigile W. Sm., Surirella striatula Tuv;pin should be S. striatula 

 Tur]pin. 



Makixe Cyanopiiyceae. 



The following species should be deleted : — Calothrix aeruginea Thur., 

 Microcoleus Chthonoplastes TImr. 



Maeine Chlokophyceae. 

 The following species should be deleted : — Chaetomorpha Liuum Kiitz., 

 Ulothrix flacca Thur., U. speciosa Kiitz. 



Marine Ehodophyceae. 

 Ceramiuui Derbesii Solier should be regarded as a doubtful species. 



DiSTltlBUTION. 

 Ptilota plumosa Ay. occurs all round the Irish coasts ; Odonthalia dentata 

 Lynyh. is confined to Ulster, though it has been found washeil up as far south 

 as Co. Dublin. 



