REPORT ON THE RADIOLARIA. 



III. MONOPYLEA or NASSELLARIA. 



Membrane of tlie central capsule simple, perforated by a porous-area, or by one single large 

 opening, divided into numerous very fine pores. Fundamental form originally 

 monaxon or egg-shaped. Skeleton siliceous. No phseodium in the extracapsular 

 caljTnma. The IMouoj^ylea comprise two orders : — 



A. Plectellaria (without complete lattice-shell). 



B. Cyetellaeia (with, complete lattice-shell). 



IV. CANNOPYLEA or PH.EODARIA. 



Membrane of the central capsule double, perforated by one simple main-opening, 

 prolonged into a tubulus, and besides this commonly by one or two (rarely more) 

 small accessory openings. Fundamental form originally monaxon or egg-shaped. 

 Skeleton sihceous. Constantly a peculiar dark pigment-body or "pheeodium" 

 in the extracapsular calymma. The Cannopylea comprise two orders : — 



A. Ph^ocystina (without lattice-shell). 



B. Ph^ocoscina (with lattice-shell). 



Synopsis qfthefom- Subclasses or Legions of Radiolaria. 



