INTEODUCTION. 



17 



Division II. CALCAREOUS SPONGES. 



Order Calcispongi^, Blainv. 



Family Phaeetrones, Zitt. 



Eudea, Lamx. 

 Colospongia, Laube. 

 Verticillites, Defrance. 

 Celyphia, Pomel. 

 Himatella, Zitt. 

 Peronella, Zitt. 

 Elasmoccelia, Rwm. 

 Conocoelia, Zitt. 

 Eusiphonella, Zitt. 

 Corynella, Zitt. 



Myrmeciiun, Goldf. 

 Lymnorea, Lamx. 

 Stellispongia, D' Orbig. 

 Sestrostomella, Zitt. 

 Blastinia, Zitt. 

 Synopella, Zitt. 

 Oculospongia, From. 

 Crispispongia, Querist. 

 Elasmostoma, From. 

 Pharetrospongia, Sollas. 



Family SyconeS; Haeckel. 

 Protosycon, Zitt. 



D 



