100 HTDROZOA. 



size, extending far beyond the margin of the short 

 gonocalyx. In other genera the reverse is usually 

 the case, the manubrium being shorter than the 

 swimming cup within which it is suspended. Each 

 gynophore, when fully developed, appears to con- 

 tain several ova. In most CalycopJioridce, except 

 Diphyes itself, both male and female reproductive 

 appendages appear on the same hydrosoma. 



Four families of Calycophoridce have been de- 

 fined by Professor Huxley. Their characters we 

 subjoin. 



Order CALYCOPHOEID^. 



Family i. Diphyd.e. 



Ccdycophoridce with not more than two, 

 potygonal, nectocalyces. Proximal liydrcecium 

 complete. Hydrophyllia. 



Family 2. SPHvERONECTIDiE. 



Ccdycophoridce with probably not more 

 than two nectocalyces; the proximal one 

 being spheroidal, with a complete hydroeciwn. 

 No hydrophyllia'? 

 Family 3. Prayid^. 



Calycophoridce with only tw^o nectocalyces, 

 whose hydroscia are both incomplete. Hy- 

 drophyllia. 

 Family 4. Hippopodiidj];. 



Ccdycophoridce with many nectocalyces, 

 whose hydroecia are incomplete. No hydro- 

 phyllia. 



The same naturalist has proposed the distinctive 

 term of 'Diphyozooids' for those singular detached 

 reproductive portioijs of adult Calycophoridce 

 which received the name of " monogastric Diphy- 



