Spongilla of Lamarck, in tripoli, 25.
"A Manual of Elementary Geology" by Charles Lyell
That one, the spongilla, is not easily found and is very difficult to maintain in the laboratory.
"A Guide for the Study of Animals" by Worrallo Whitney
Spongillae in which the gemmules are covered with a thick, apparently granular pneumatic coat.
"Freshwater Sponges, Hydroids & Polyzoa" by Nelson Annandale
Ganin appears, however, to maintain a contrary view for Spongilla.
"The Works of Francis Maitland Balfour, Volume 1" by Francis Maitland Balfour