hexactinellida การใช้

• It consists of the Poriferan classes Demospongiae and Hexactinellida.
• The "'siliceous sponges "'form a major group of the phylum Porifera, consisting of classes Demospongiae and Hexactinellida.
• He was especially interested in a class of sponges known as Hexactinellida, of which he studied from collections taken from the U . S . " Albatross Expedition " and the British " Challenger Expedition " ( 1873 76 ).