386 Proceedings of the Royal Irish Academy. 



113. Spicules of Scirpearia quadrilineata, n. sp. 



114. Spiciiles of Nicella dichotama, 



115. Spicules of Nicella fldbellata. 



116. Spicules of Nicella reticulata. 



117. Three portions of Nicella monUiforme, enlarged (x5) to show the 



difierence in the distribution and nature of the verrucae at the 

 various levels, («) near the base, {h) middle of the colony, (c) near 

 the tip. 



118. Spicules of Nicella monUiforme. 



