Halichondriae
Halichondriae (hal`i*kon"dri*ē) , proper noun, plural
[New Latin, from Greek "a`ls, "alo`s, sea + cho`ndros cartilage.]
(Zoology) An order of sponges, having simple siliceous spicules and keratose fibers; -- called also Keratosilicoidea.