146 Guide to Belfast. 



sented — N. ti/icinatiitn, N. Gfnelmi, N. laceration and its 

 variety unci/iafiim, JV. reptajis, JV. pitncfatuni, JV. Bonne- 

 maiso?ii, and N'. HUUcb — these occur at Murlough Bay. 

 Polysiphonia dtva?-icata, a rare form washed up at Murlough. 

 Here also, on rocks at low water, grows Cefamium Derbesii., 

 a plant not previously known in the British flora. Many 

 forms of Calcareous Algee are recorded from Down and 

 Antrim ; the following, among others, are of interest : Litho- 

 t/iamnion Icevigafi/i/i, L. Lc/io}-?Ha/idi, L. colliculostiin f. rosea., 

 L. fa'cundum, a northern species ; L. fasciculntum f eunana 

 (the above are found in Larne Harbour). 



Green Seaweeds. — The Confervoids, their allies the 

 Chlorophycece-, and the remaining group of the Blue-Green 

 Seaweeds {Cyanop/iycece) have not attracted the same atten- 

 tion as the other groups hitherto ; consequently less is known 

 of their distribution. The following are known to occur : 

 Monostroma fuscum, Larne ; AL Blyttii, Larne ; M. Lactuca, 

 Tor Head ; Ui'ospora petiicillatum, Tor Head ; Bryopsis 

 plumosa, Tor Head ; Rivularia Biasotettia/ia, Tor Head, 

 on rocks near high-water mark, exposed to spray. 



References. — W. H. Harvey, Phycologia Britan?iica, 1846-51 ; 

 Holmes and Batters, A Revised List of the British Marine Alg(s, and an 

 Appendix [Ann. Hot., vol. v, 1890); T. Johnson and Miss Hensman, 

 A List of Irish Corallinaceas {Sci. Proc. R. D.S. , vol. ix, i. No. 3); 

 T. Johnson, H. Hann.a., Miss Hensman, and Miss Knowles, Irish 

 Phreophycese {Proc. R.I. A., 3rd ser., vol. 5, No. 3 ; H. Hanna, Some 

 Algas from the Antrim Coast (Irish Nat. , vol. viii. No. 7). 



H. H. 

 Freshwater Alg^. 



A century ago, when they were not so well known as 

 now, Templeton compiled a list of 75 species. There 

 are also references to work done in this group by Robert 

 Brown, Drummond, and William Thompson, who found 

 Anabcena flos-aqucE var. circinalis Rabh. colouring the waters 

 of Ballydrain Lake. Harvey mentions few localities in 

 Flora JPibernica, nor does he refer to the work of previous 

 botanists. Many localities for Diatoms are recorded from 

 the two counties in O'Meara's Report. 



The following are a few of those recorded by Templeton : 

 Lemanea fluviatilis., in rapid streams on the INIourne moun- 



