REPORT ON THE RADIOLARIA. 



180. Hypothetical Genealogical Tree of the Nassellaria. 



Cyrtoidea 



Botryodea 



Pylobotryida 



Eradiata, 

 Lithocampida 



Lithobotryida 



C'aimobotryida 



Stephoidea 



Tympanida 



Coronida 



Theocyrtida 

 Scthocyrtida 

 Cyrtocalpida 



Triradiata 

 Podocampida 



Podocyrtida 



Tripocyrtida 



Tripocalpida 



Mtiltiradiata 

 Phormocampida 



Phormooyrtida 



Anthocyrtida 



Phsnocalpida 



Scmautida 



Cyrtellaria 



Stephanida 



Cortiniscus 



Cortina 



cxvn 



Spyroidea 



Androspyrida 



Tholospyrida 



Phormospyrida 



Zygospyrida 

 (Spyroidea triradiata) 



Plectaniscus 

 Tetraplecta 

 Plectophora 

 Tripleota 



Cortinida 



(Cortina) 



Plagoniscus 

 Tetraplagia 



Plagiacantlia 

 Triplagia 



(Plectellaria) 



Plectoidea 



Plectanida 



Plagonida 



Nassoidea 



(Nassellida) 



Nassella 

 (Cystidium) 



Actissa 



