"Hydrozoa" Article - Table of Contents
Part 1. Introduction.
Part 2. Fundamental Forms of the Hydrozoa.
Part 3. Comparison and Relations of Hydriform and Medusiform Persons.
Part 4. Hypothesis of the Individuation of Organs.
Part 5. Definition of the Hydrozoa.
Part 6. Fossil Hydrozoa. Relationship of the Ctenophora to the Hydrozoa.
The above article was written by: E. Ray Lankester, F.R.S., Professor of Zoology, University College, London.