4 books in this genre
Review of the family Halopterididae (Hydrozoa, Cnidaria)
Peter Schuchert
Shallow Water Hydroids of Bermuda
Dale R. Calder
Experimental coelenterate biology
Howard M. Lenhoff
British Anthozoa (Coelenterata:Octocorallia & Hexacorallia)
R. L. Manuel
