The document classifies invertebrates into 9 phylums: Porifera, Coelentrata, Echinodermata, Arthropoda, Annelida, Mollusks, Platyhelmenthis, Aschelmenthis, and Coardata. It then provides further details on the phylum Coelentrata, noting that the name is derived from Greek words meaning hollow intestine, referring to these animals having a hollow sac-like intestine.