FTP, name this invertebrate phylum of sea anemones, corals, and jellyfish.
Members of this phylum have a three-layered body wall consisting of an epidermis, a gastrodermis, and a mesogloea (mess-o-GLEE-a).  Tentacles encircling the mouth are used for food capture, and also contain the highly distinctive nematocysts (knee-MAT-o-sists) that characterize the phylum.  They have two characteristic body forms, a sessile hydroid or polyp form that attaches to a substrate, and the motile medusa form that is common in the Physalia or Portuguese man-of-war.  FTP, name this invertebrate phylum of sea anemones, corals, and jellyfish.
Members of this phylum have a three-layered body wall consisting of an epidermis, a gastrodermis, and a mesogloea (mess-o-GLEE-a).  
Cnidaria or coelenterata (SEAL-ent-er-at-a)