A history of the British hydroid zoophytes

Medusae of the World

Alfred Goldsborough Mayer

Notes on British hydroid zoophytes and other subjects

Philip James Rufford

Mémoires pour servir à l'histoire d'un genre de polypes d'eau douce

Abraham Trembley

Common hydroids, corals and echinoderms

Alpheus Hyatt

Die entstehung der sexualzellen bei den hydromedusen

August Weismann

An attempt towards a natural history of the polype

Henry Baker

American hydroids ..

Charles Cleveland Nutting

Biological studies on Corymorpha

Harry Beal Torrey

Distribution and relationship in American hydroids

C. McLean Fraser

A monograph of the gymnoblastic or tubularian hydroids

George James Allman