INDEX. Vll 



Page. 



Platyarthrus Hofl'manseggii, on the genus, with notices of allied genera, .... 188 



Polyzoa, on new genera and species of, 77 



Post-tertiary deposits of Belfast, on shells found in, 202 



Powerscourt, county of Wicklow, Diatomacea occurring at, 63 



President's address, 157 



Provinces, botanical, of Ireland 247 



Pyramidellidffl from Cork and Clonmel, on, 281 



Quadrupeds, on the anatomy of the brain in some small, 223 



Report from Council for 1857-58, 155 



Resolutions of Association, 61, 133 



Rlunolophus hipposideros in Galway, ...*.... 264 



Sagartia hastata (E. P. W.), (n. «.) 181 



Scrupocellaria ornithorhynchus, a new species of Polyzoa, 90 



Shells found in the post- tertiary deposits of Belfast, on the, . 202 



, table of same, 222 



Sphenotrochus Wrightii, a new Irish Madrepore, 234 



Sterculia Alexandri (Harvey J, (w. ».), 140 



Supplementary catalogue of Desmidiaceaa found in the neighbourhood of Dublin, 94 



Table of distribution of Irish Actinid®, 187 



Terebratula Gwynia (King), 258 



Thomson, Professor "Wyville, LL. D., on new genera and species of Polyzoa from the 



collection of Professor Harvey, 77 



Tissue, fibro- cellular occurring in an Alga, 63 



Unicellular Alga, note of the occurrence of one near Dublin, 124 



Urticating organs of Actinia, 163 



Vice-President's address, 1857, 1 



Wright, Dr. E. Perceval, A. M. } F. L. S., notes on a new species of Bunodes, . . 131 



■ , notes on the Irish Actinidae, with especial 



reference to their distribution, « 174 



