182 SPHAERONECTES. 



2. Galeolariinae Chun. Nectophores of about the same size; rounded, 

 mostly without sharp ridges. Groups of appendages permanently 

 sessile. 



3. Diphyopsiinae Haeckel. Nectophores pyramidal, with strong ridges. 

 Groups of appendages detached as free Eudoxids, with rounded bracts. 



Prayidae Kolliker. With 2 (or temporarily 3-4) nectophores, all structurally 

 alike. 



1. Amphicaryoninne Chun. Oldest nectophore with its nectosac degen- 

 erating into a bract-like shield partially enclosed bj^ the younger one. 

 No "reserve bells." Has free Eudoxids. 



2. Prayinae Haeckel. The two rounded nectophores are replaced suc- 

 cessively by the formation of new ones. Groups of appendages remain 

 sessile (?). 



3. Stephanophyinae Chun. Several nectophores arranged in a ring. 

 Somatocyst replaced by a system of branching canals. Groups of 

 appendages sessile. 



Hippopodiidae Kolliker. With many nectophores, all structurally alike. Groups 

 of appendages sessile. Without bracts. 



Sphaeronectidae Huxley, 1859. 



Sphaeronectinae Haeckel, ISSS. 



The two genera of this subfamily, Sphaeronectes and Monophyes, recog- 

 nized by Haeckel ('88b) and by Chun ('92, '97b) are separated only by differences 

 in the form of the hydroecium and of the somatocyst, so slight that they are 

 only of specific importance. I therefore follow Schneider ('98) in uniting them 

 under the older name, Sphaeronectes. The recently discovered genus Necto- 

 pyramis is also included here, provisionally, because its affinities are evidently 

 closer with this subfamily than with the Muggiinae. But until its devel- 

 opment is known its position cannot be determined. 



SPHAERONECTES Huxley, 1859. 



The structure of this interesting compound genus has been so thoroughly 

 studied by Claus ('74) and by Chun ('92) that it is necessary to examine only 

 the validity of the five species S. {Monophyes) gracilis Claus, S. kollikeri Huxley, 

 (S. {Monophyes) irregularis Claus, 8. {Monophyes) brevitruncata Chun, and S. 



