16 50 Proceedings of the Royal Irish Academy. 



pusillumi, Oadosphaerium kuetzingianum, Aphanotheca microscopica, Dactylotkeca 

 Braunii, Staurastntm paradoxum, S. denticulatum, Euastrum binale v. hians, 

 Scenedesmus quadricauda, Pediastrum glanduliferum, &c. 



A large tuft of a sterile Vaucheria from near Westport was examined to 

 ascertain what was the association of other algae amongst it. It turned out 

 to be mostly a Diatom association ; I enumerate some — the chief of the 

 species present, in the order of their prevalence : — Tahellaria Jlocculosa, 

 Fragilaria capucina, Si/nedra Ulna, Amphora ovalis, Navicula viridis, N. nobilis, 

 j¥. vii-idula, Eunotia praempta, E. pectinalis, Cocconema gasiroides, Surirella 

 ovalis, S. biseriata, Gomphonema montanum v. commutatum , Nitzschia Paha, 

 Meridiem circulare, Stauroneis anceps, Navicula limosa, N. bicapitata, N. 

 appendiculata, N. pusilla, &c. A few chlorophyllaceous algae were also 

 present in small quantity : — IT/othrix aequalis, Ankistrodesmus falcatus, 

 Selenastrum gracile, Staurastrum orbiculare, S. punctulatum, Cosmarium 

 Botrytis and Closterium Cynthia. 



MARINE DIATOMS. 



The following contractions for localities have been used : — 



AS = Achill Sound. ONE = Clare Island, N.E. shore, 

 BB = Bellacragher Bay. includes a number of different 



C = Shores of Clare Island (no gatherings. 



definitely indicated place K = Kinnacorra, Clare Island. 



thereon). M = Mulranny. 

 CB = Clew Bay. 



Class BACILLARIACEAE (Diatomacuae). 

 Div. I. BAPHIDIEAE. 

 Tribe Cymbelleae. 

 Amphora angularis Greg. — CB. 



*marina V. H. (non W. Sm.) — AS. 

 salina "W. Sm. — CB, C: CXE, 28-41^ long; L, mouth of Bunowen 



Eiver, 38/t long. 

 *Proteus Greg. — AS. 

 *veneta Kutz.— CB, CNE. 



Tribe Naviculeae. 

 Gyrosigma angulatum (Quek.) O.K. — CB, 150 x 3T6/J. 

 affine (Grun.) O.K.— AS, a narrow form 173 x 28-5/i, 



