demospongiæ

from The Century Dictionary.

• In Sollas's classification of sponges, a subclass of Silicispongiæ in which sexradiate spicules are absent. It is divided into two orders, Monaxonida and Tetractinellida.
• A class of Porifera consisting of the orders Carnosa, Tetractinellida, Halichondrina, Hadromerina, Dictyoceratina, Dendroceratina, and the Myxospongida.