188 Proceedings of the Royal Irish Academy. 



I. — DiATOMACEAE — cotitimied. 

 Amphora 



quadrats Greg. = A. Gregoryi Pritch. 



sulcata Boper = A. erassa Greg. 



ventricosa Greg. = A. turgida Greg. 

 Bacillaria 



paradoxa Grun. = Nitzschia paradoxa Gmel. 

 Biddulpbia 



mobiliensis Bail. - B. Baileyii W. Sm. 



radiata TF. Stn. = B. Smithii H. Van. Heurck. 

 Campylodiscus 



cribrosus W. Sm.= C. Ecbeneis Ehr. 



parvulus TF. Sm. = C. Tburetii Brcb. 



simulans Greg. = C. Tburetii Breb. 

 Cocconeis 



binotata Grun. = Ortboneis binotata Grun. 



coronata Brightw. = Ortboneis coronata Grun. 



excentrica Donk. = Anortboneis excentrica Grun. 



fimbriata Brightw. = Ortboneis fimbriata Grun. 



piunata Greg.= C. brundusiaca Rabh. 



punctatissima Grev. = Ortboneis punctatissima Lagerst. 

 Colletonema 



eximium Kits. = Pleorosigms eximiom Grun. 

 Coscinodiscos 



Ebrenbergii O'Meara = C. lineatns Ehr. 



omphalanthus Ehr. = C. Asterompbalus Ehr. 



radiolfttus Ehr. = C. fimbriatus Ehr. 

 Creswellia 



fcurria Grev. = Stepbanopyxis turris Rolfs. 

 Cydotella 



dallasiana TF. Sm. <• C. striata Grun. 



scotica KuU. = Hyalodiscus scoticus Grun. 

 Denticula 



nana Greg. = Dimeregranuna nanum Bai/s. 

 Diadesmis 



Willi&msonii W. Sm. = Glypbodesmis Williamsonii Gnm. 

 Diatoma 



auritum Lyngb. = Biddulpbia aurita Breb. 



fasciculatum Ag. = Synedra aflSnis Kutz. 



byalinum Kutz. = Fragilaria byalina Grun. 



marinum Lyngb. = Grammatopbora marina Kutz. 



obliqaatum Lyngb. = Isthmia sp. 



