photo from Sponge V by B. Picton
B. Picton, Strangford Lough, Northern Ireland
G. Ackers, Swanage Pier, England, 3 m
from Holland, photo L. van der Laan
from Bowerbank, 1874
ect. skeleton compared with H. panicea
habits of preserved specimens from Holland
Sponge V drawing by Christine Morrow
photo from Le Havre