140 Proceedings of the -Royal Irish Academy. 



113. Spicules of Scirpearia guadrilinea.ta, n. sp. 



114. Spicules of Nicella dichotoma. 



115. ST^icnies oi Mcella flabellafa. 



116. Spicules of Nicella. reticulata. 



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



difference in the distribution and nature of the verrucae at the 

 various levels, (a) near the base, (J) middle of the colony, (c) near 

 the tip. 



118. Spicules of Nicella moniliforme. 



