EEPORT ON THE BADIOLARIA. 



485 



Synopsis of the Genera of the Porodiscida continued. 



5. Subfamily 



Euchitonida. 



Margin of the disk with 

 radial chambered arms 

 (or hollow chambered - 

 appendages), on the distal 

 end of the arms with 

 or without solid radial 

 spines. 



Subfamily 1. ARCHIDISCIDA, Haeckel. 



Definition. P orodiscida with a simple spherical or lenticular latticed central 

 chamber, surrounded by a single concentric latticed ring, which is divided by radial 

 beams into two to six or more radial chambers. 



