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by Henry Baker
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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
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