Hydroida

The marine fauna of New Zealand: Scleractinia (Cnidaria:Anthozoa)

by Stephen D. Cairns.

Shallow Water Hydroids of Bermuda: The Athecatae (Royal Ontario Museum Life Sciences Division//Contributions)

Dale R. Calder

Hydroids from Izu Ôshima and Niijima

by Hirohito.

Some hydroids of the Amakusa Islands.

Hirohito Emperor of Japan

Five hydroid species from the Gulf of Aqaba, Red Sea

by Hirohito.

Land and fresh water mollusks

by William H. Dall. Hydroids / C.C. Nutting.

Sexual dimorphism in Aglaophenia

by Harry Beal Torrey and Ann Martin.

Land and fresh water mollusks

by William H. Dall.

The hydroids of the west coast of North America: with special reference to those of the Vancouver Island region

C. McLean Fraser.

A new hydroid, Hydractinia bayeri n. sp. (family Hydractiniidae), from the Bay of Panama

by Hirohito, Emperor of Japan.