(Spongilla)

from The Collaborative International Dictionary of English v.0.48

Spongilla \Spon*gil"la\ (sp[o^]n*j[i^]l"l[.a]), n. [NL., dim. of
   spongia a sponge.] (Zool.)
   A genus of siliceous sponges found in fresh water.
   [1913 Webster]