234
J. A. KITCHING AND F. J. EBLINa
Cortazia costazii
o 5 colonies per lo00 rq.crn.
(4
0 up to 5 colonler per 1 ~ r q . r m .
(el
FIG. 23. Distribution of the Polyzoa, Coatazia costazii, Scrupocdlaria reptam and Cdepora
pumicosa on boulders throughout the Lough Ine Rapids in July 1950.