15 l6€ Proceedings of the Royal Irish Academy. 



IV.— THE CHARACTER OF THE FLOKA. 



I. Notes on the Novelties and Additions. 



As already mentioned, the systematic list contains the names of 4^7 

 species and 36 varieties. The revised census, as recorded by Mr. Adams' 



private annotated copy, gives the total number of species for Ireland as 464 ; 

 so that making allowances for 12-15 species which are now regarded as 

 synonyms or varieties, the Survey list is within fifteen species of that for the 

 whole of Ireland. 1 As a local list, it must therefore he regarded as very 

 complete, though amongst microscopic and sub-littoral species additions 

 doubtless could he made by careful and continuous searching. 



The list of additions to Ireland, which consists of ninety-two species and 

 eleven varieties, is given below. It will he noted that it includes eighteen 

 species and four varieties (marked f) new to the British Isles, of which the 

 following five are new to science: — Calothrix endophytics, Codium mucronatum 

 var. atlanticwm, var. now, Ascocychis SeiecJiarinae, Fucus vesiculoaus var. 

 museoides var. nov., Ptilothanmion lucifugwm. 



Aphanocapsa pallida. P. Battersii. 



Derinocarpa violacea. P. norvegicum. 



Plfiurocapsa amethystina. Microcoleus chthonoplastes. 



Spirulina subsalsa var* Oceania. M. tenerrimus. 



Oscillaria margaritifera. Calothrix consociata. 



0. Coralliuae. fC. endophy tica sp. u<>c. 



0. laete-virens. 0. parasitica. 



0. sain ta. C. aeruginea. 



Phormidium fragile. Brachytrichia Balani. 



fP. persicinuin. Microchaete grisea. 



tP. subuliferum. Codiolum gregarium. 



Lyngbya Meneghiniana. C. Petrocelidis. 



fL. confervoides. Frotoderma niarinuin. 



L. semiplena. Ulvella fucicola. 



L. lutea. Monostroma orbiculatum. 



t'Symploca dubia. Capsosiphon aureolus. 



Plectonema Nostocorum. Enteromorpha prolifera. 



1 Some further species would have had to l>e added if Batters' Catalogue had been exactly 

 iollowed ; but in the systematic section several reductions have been made. 

 • In this list signifies that the variety only is new to Ireland. 



