ceratosa

from The Century Dictionary.

• The horny or fibrous sponges; the Ceratoda. Also Keratosa. Bowerbank.
• As restricted by Lendenfeld, a suborder of sponges, of the order Cornacuspongiæ, supported by a skeleton of spongin (exceptionally without any skeleton at all), the fiber without spicules proper, but with or without foreign bodies. In this sense it is composed of the families Spongidæ, Aplysinidæ, Hircinidæ, Spongeliidæ, Aplysillidæ, and Halisarcidæ. Also Keratosa.