CXXIV 



THE VOYAGE OF H.M.S. CHALLENGEE. 



194. Hypothetical Genealogical Tree of the PhcBodaria : — 



Phaeoconchia 

 Pheeosphseria Coeloplegmida 



Aularida 



Aulonida 



Coelotholida 



Ccelographida 



Aulosphferida 



Sagmarida 



Cannospliaericla 



Conchopsida 



ConchaBmida 

 Conchai'ida 



OroBcenida 



Concliarida 



Sagenida 



Sagosp]ueiiJa 



Oronida 



Orosplui;iidii 



Phseodinida 



Phseocystina 



Aulacantliida 



Onnobelida 



Catinulida 



Dictyochida 



Cannorihaphida 



I 



PhaeosTomia 



Ccelodrymida 



Coelodorida 



CceloJeiitliiJa 



Tuscaroiida 



Haeckelinida 

 Circogoaida 



Castanc-IliJa 



Circoporida 



Gazellettida 



Pharyngellida 



Euphysettida 

 Medusettida 



Lithogromida 



Clialleucrerida 



PhiEodinida 



PhiEodinida 



Phseodina 



(Phseometra) 



ActiEsa 



