DUBLIM KATUBAL HI8T0BY 80CI£TT. 39 



CULOROSPERME^. 



Order — CoirrBRVAcsA. 

 Conferva melagonium. 



Order — Ulvacba. 

 Enteromorpha intestinalis. 

 ,, compressa. 



M clatnrata. 



Ulva latissima. 



Order — Siphon acka 

 Bryopsis plumosa. 



Order— CoNPBBVACEJt. 

 Cladophora rupestris. 

 ,, laeteTirens. 



„ albida. 



t, uncialis. 



,, glaucescens. 



Mr. Andrews said, that the riews that had been given by Mr. Sanders were 

 most valuable and interesting, and reasons were clearly given why an appa- 

 rent dearth of algce existed on the east coast, compared with the west or 

 south-west. Zealous local investigation, like that shown this evening, would 

 still add much to the list. Mr. Andrews then enumerated many rare spe- 

 cimens that he had obtained oTi the west coast, which were, at present, com- 

 pletely local there. He had collected very large specimens of Taonia atomaria, 

 which he had given, with many others, to his friend, Dr. Harvey — the Taonia, 

 unfortunately, too late for insertion in his valuable work. Taonia is by no means 

 uncommon as a southern plant. Polysiphonia violacea is abundantly met at 

 Ferriter's Cove, county of Kerry, and specimens of Dasya ocellata are found 

 there. Conferva reotangularis was found in quantities in Killarney Bay, in the 

 Great Arran Island. This plant was previouslv discovered in great abundance 

 on the coast of Connemara, by the inaefatigable investigator, the late William 

 M'Calla. Mr. Andrews also mentioned that some years since he had obtained 

 Microcladia glandulosa, thrown ashore in the neighbourhood of Dalkey. It waa 

 singular, yet true, that seasons much affected the appearance and disappearance 

 of aquatic plants among the algae and confervw. In noticing such in his cor- 

 respondence, Mr. John Ralfs, of Penzance, author of the "British Desmidiae," 

 observes — " I have watched for the last three years many stations of Mougeotia 

 coerulescens, Zygnema curvatum, various species of Desmidiae and Vesiculiferse, 

 and have never found the same species two years in the same pool, nor, indeed, 

 have I seen any of the above plants I found a few years since in the same water. 

 This should teach us to gather a good supply of specimens when we have an op- 

 portunity, lest we should not meet with them again." 



JUNE 15, 1855. 



OM THX BrFECTS OF SEVERE FEOST ON PLANTS IN THE NEIGHBOCBBOOD 

 OF SLIOO. BT THE RIGHT HON. J. WYNNE. 



Having seen an interesting paper, read by Mr. Moore at a meeting of the 

 Dublin Society, on the effects of the late severe frost on the outdoor plants in 

 the Botanic Gardens at Glasnevin, it struck roe that it might interest the mem- 

 bers of the Natural History Society to have some information on the effect pro- 

 duced by that frost in the west of Ireland, where the severity of frost is gene- 

 rally so much tempered by the vicinity of the Atlantic Ocean. I, unfortunately, 

 did not possess a self-registering thermometer, so as to give the exact amount of 

 frost here, but I may give some facts which indicated its severity. First— The 

 adjoining lake was frozen across, so as to bear skating for about one-third of its 

 length for about a fortnight — a circumstance which never occurred in my recol- 

 lection, and 1 believe only once during the lifetime of my father, who lived to be 

 85, and spoke of his having once skated across the lake, which we did several 

 times this last season. Sicondly — The number of birds killed by it was very 

 great, especially sea birds— curlews and seagulls After the thaw, the sea^shore 

 was covered with dead sea fowl. However, we can arrive at a tolerable dej?ree 

 of accuracy, as the thermometer at Markree ObserrRtoFy, only six miles ^om 



