The question of the geographical range of the sponges, hydroids, and polyzoa of brackish water may be considered briefly, for it is of importance in considering that of those which are confined to fresh water.
"Freshwater Sponges, Hydroids & Polyzoa"
Nelson Annandale
Then contours became traceable, smooth rounded shoulders of hills frayed out into jagged strata, with the close-shaven fur of bushes and shrubs, and occasional tall slender palms reminding one of single hydroids on the sargasso fronds.
"Jungle Peace"
William Beebe