254 I'roceedings of the Royal Irish Acadetnij. 



I'LATE XXV ILL 



Mogascleres x o30; geiinimle-sijieiiles x GOO. 



1. Eiihjidtitia Mulhri \A{i\)Q\-k\s\\n. a, inegascleres ; ft, c, side and end views 



of aniijliidiscs. Kiver Tolka, Co. Dulilin. 



2. Hdcromcijcniu liijdcri I'otts. Typical I'unii. «, inegascleres ; h, c, side 



and end view of shorter anipliidiscs ; tl, longer anipliidisc. Stream 

 fiiMii C'liiinianare I.,;ikeK, Co. Kei ry. 

 .). lliti ivmci/cniii liinhri I'otts. <t, uicgasclores ; h, c, shorter ami Imiger 

 ani)ihidiscs. I'ark lA)iigli, Hungry Hill, Co. Cork. 



4. Ill tiiomfi/enut liijdcti I'ott.s, form L'alcni I'otts. a, niegascleres ; 



b, c, shorter and longer ainphidiscs. Longji Yganavaun, Co. Kerry. 



5. IletcromeycHM liydcri l'ott«, form jnctui-cnsU I'otts. n, niegMscleres ; 



h,c, shoi'ter ; and </, longer am]>hidisc8. Lmigh Coolanick, Inislilurk, 



Co. Mayo, 

 (i. Uctciome.yrnin Uydcri \'o\jls, ioxwx piclorensis Voii^. Megascleres. Lough 



Altnadun, Co. Down. 

 7. Jldcrointyrniii Itydni I'otts, form pidornisis I'otts. Megascleres. Lake 



on Carnlough Mountains, Co. Antrim. 

 S. Ilderomeyenia liydcri I'otts. Semi-typical form, n, megascleres ; 



h, r, .shorter and longer amphidiscs. Lower Lough Bray, 



Co. Wicklow. 



PI.ATK X.XIX. 



Maps showing the distribution of the fresh-water sponges in Ireland as 

 at present known — fig. 1, Spongilla lacuslria ; fig. 2, SpomjUla fragilis ; fig. 3, 

 Epki/daliti fluriatilis ; fig. 4, Ephydalui fluciatilis, var. ; fig. 5, EpJn/datia 

 MiilUri; tig. 6. Ildinimi-iirnin Iti/dcri. 



