92 THE CRAG POLYZOA. 



Sub-order II. CYCLOSTOMATA. Busk. 



Cellulis tubulosis, rigidis, ex parte liberis, et distantibus, sen connatis et immersis. 

 Orificio terminali ineruii. 



Cells tubular, rigid, wholly immersed and connate, or partially free and distant ; 

 mouth terminal ; unfurnished with any moveable appendage ; usually of the same diameter 

 as the cell. 



TUBULIFORINA, Milne Edwards ; Hagenow ; Johnston. 

 AuLoroiUNA (pars), Ehrenlerg ; Johnston. 

 MYRIOPORINA (sp.), Ehrenlery. 

 CERIOPORINA (pars), Bronn. 



^ I. ARTICULATE s. RADICATJL. 



Polyzoano ex internodiis inter se articulatis composito ; perque tubulos corneos radi- 

 cales affixo. 



Polyzoarium divided into distinct internodes, usually connected by flexible joints; 

 attached by horny tubes. 



Yam. I. CRISIID.E, M. Edwards. 

 The only family. 



Genus 1. CRISIDJA, M. Edwards. 



Internodiis unicellularibus. 

 A single cell in each internode. 



No species occurs among the Crag fossils. 



