100 HYDROZOA. 



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 Calycojphoridce, except 

 Diphyes itself, both male and female reproductive 

 appendages appear on the same hydrosoma. 



Four families of Ccdycophoridce have been de- 

 fined by Professor Huxley. Their characters we 

 subjoin. 



Order CALYCOPHOKID^, 



Family i. Diphyd^. 



Galycophoridce with not more than two, 

 polygonal, nectocalyces. Proximal hydroeoium 

 complete. Hydrophyllia. 

 Family 2. Spu^ronectid^. I 



Galycophoridce with probably not more 

 than two nectocalyces; the proximal one 

 being spheroidal, with a complete hydroecium. 

 No hydrophyllia? 

 Family 3. Prayidjs. 



.Galycophoridce with only two nectocalyces, 

 whose hydrcBcia are both incomplete. Hy- 

 drophyllia, > 

 Family 4. Hippopodiid^. ■ 

 Galycophoridce with many nectocalyces, 

 )vhose hydroecia are incomplete. No hydro- 

 phyllia,, 



The same naturalist has proposed the distinctive 

 term of ^Diphyozooids' for those singular detached 

 reproductive portions of adult Galycophoridce 

 which received the name of '* monogastric Diphy- 



