_Gyroceras_.
_Hadrosaurus_.
_Halitherium_.
Hallstadt Beds.
_Halobia_.
_Halysites; agglomerata; catenularia_.
Hamilton formation.
_Hamites; rotundus_.
_Haplophlebium Barnesi_.
Harlech Grits.
_Harpes; ungula_.
Hastings Sands.
Headon and Osborne series.
Heart-urchins.
_Heliolites_.
_Heliophyllum; exiguum_.
_Helix_.
_Helladotherium_.
_Helopora fragilis_.
_Hemicidaris crenularis_.
_Hemiptera_.
_Hemitrochiscus paradoxus_.
Hempstead Beds.
_Hesperornis; regalis_.
_Heteropoda_; of the Lower Silurian; of the Upper Silurian;
of the Devonian; of the Carboniferous.
_Hinnites_.
_Hipparion_.
_Hippopodium_.
_Hippopotamus; amphibus; major; Sivalensis_.
_Hippothoa_.
Hippurite Marble.
_Hippurites; Toucasiana_.
_Hippuritidoe_.
_Histioderma_.
Hollow-horned Ruminants.
_Holocystis elegan_.
_Holopea; Subconica_.
_Holopella; obsoleta_.
_Holoptychius; nobilissimus_.
Holostomatous Univalves.
Holothurians.
_Holtenia_.
_Homacanthus_.
_Homalonotus; armatus_.
_Homo diluvii testis_.
Honeycomb Corals.
Hoofed Quadrupeds.
Hudson River Group.
Huronian Period; rocks of.
_Hyoena crocuta; speloea; Hipparionum_.
_Hyoenictis_.
_Hyoenodon_.
_Hyalea D'Orbignyana_.
_Hybodus_.
_Hydractinia_.
Hydroid Zoophytes.
_Hymenocaris vermicauda_.
_Hymenophyllites_.
_Hymenoptera_.
_Hyopotamus_.
_Hyperodapedon_.
_Hypsiprymnopsis_.
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