Chapter II: CALYCOPHORIDA (Calyconectae, Haeckel). Without pneumatophore, with

one, two, rarely more nectocalyces.

Three families: (1) _Monophyidae_, with a single nectocalyx; examples
_Muggiaea_, sometimes found in British seas, _Sphaeronectes_, &c.; (2)
_Diphyidae_, with two nectocalyces; examples _Diphyes_ (fig. 72),
_Praya_, _Abyla_, &c.; and (3) _Polyphyidae_, with numerous
nectocalyces; example _Hippopodius_, _Stephanophyes_ and other genera.

FIG. 75.--A. _Physalia_, general view, diagrammatic; B, cormidium of Physalia; D, palpon; T, palpacle; G, siphon; GP, gonopalpon; M[male], male gonophore; M[female], female gonophore, ultimately set free.]