Halecium, Genus
Halichondria, Genus
Haliclona, Genus
Halidrys, Genus
Harmothoe, Genus
Hartlaubella, Genus
Heterosiphonia, Genus
Hexacorallia, Classis
Hildenbrandia, Genus
Hippocampus, Genus
Hippolyte, Genus
Homarus, Genus
Hyas, Genus
Hydractinia, Genus
Hydrobia, Genus
Hydrozoa, Subphylum
Hymeniacidon, Genus
Hypoglossum, Genus