(After Allman.) logy as the monopodial or racemose, and the sympodial or cymose types respectively; each is characteristic of one of the two sub-orders of the Hydroidea, the Gymnoblastea and Calyptoblastea.
The two kinds of persons present in the typical Hydroidea make the classification of the group extremely difficult, for reasons explained above.
A natural classification of the Hydroidea has yet to be put forward.
Hydroidea Gymnoblastea (Anthomedusae).
SUB-ORDER HYDROIDEA CALYPTOBLASTEA (LEPTOsome with polyps always differentiated into nutritive and reproductive individuals(blastostyles) enclosed in hydrothecae and gonothecae respectively; with sympodial type of budding.
- There cyclosystems placed at can be no doubt that the forms comprised intervals on the in this order bear a close relationship to the branches, each with a Hydroidea, especially the sub-order Gymnocentral gastropore and blastea, with which they should perhaps be zone of slit-like dac classed in a natural classification.
Spencer, " A new Family of Hydroidea (Clathrozoon), together with a description of the Structure of a new Species of Plumularia," Trans.