Hydrocyon, [575];

H. goliath, [578]

Hydrocyoninae, [575]

Hydrolagus colliei, [469]

Hygrogonus, [672]

Hymenocephalus, [647]

Hyodon, [553];

H. alosoides, skull and pectoral arch, [553]

Hyodontidae, [552], [544], [389], [405]

Hyostylic, [222]