TERMINOLOGY 



Bryozoid. The common name for all the individuals of a colony. 



Zooecium (- autozooeciutn). A chamber in which a polypide is or has been lodged. 



Heterozooeclum. A chamber in which there is no polypide or only a vestige of one in 

 the form of a small cellular body. On the other hand the chamber contains a powerful 

 muscular apparatus for the movement of the operculum, which in the avicularium is called 

 the ))mandible« and in the vibraculum the wflagelluma. 



Kenozocecium. A chamber in which there is no polypide and as a rule no muscles 

 and no aperture. 



Gonozooecium. A modified zooecium set apart for reproductive functions. 



Polypide. The alimentary canal with tentacles etc., belonging to a zooecium. 



Gymnocyst. A calcified pari of a Bryozoid which arises by the transformation of a 

 covering membrane. 



Cryptocyst. A calcified part of a Bryozoid which arises within a covering membrane. 

 A cryptocyst arising from the vertical walls may be called a »priniary(( cryptocyst and 

 that arising from a frontal gymnocyst a ))secondary« cryptocyst. 



Ectocyst. A cuticle secreted by a covering membrane. 



Epitheca. A membrane covering a calcified surface. 



Rosette-plate (— communication-plate). A diaphragm, pierced by one or more exceed- 

 ingly line pores, occurring in the walls of adjacent Bryozoids. Through these pores pass 

 fine branches of a tissue (the endosarc or the mesenchymatous tissue) which maintains 

 the coinnuinication between all the members of the colony. 



Pore-chamber. A small space situated in the boundarj* between two walls of a zoa'ciuin, 

 the inner part of which is provided with one or more rosette-plates. 



Pores. Most of the so-called pores are not real pores, but only uncalcified (membran- 

 ous) spots in dilfercnt calcareous surfaces. In the present work such uncalcilied spots 

 arc sometimes (e. g. in the Catenariidae) called »excisions«, )>perforations«, i>lissurcs« or 

 >ifenestrEe«, and the last signification is as a rule used about unusually large and regularly 

 arranged pores. Real pores are found in the rosette-plates, in the frontal shield of the 

 Cribrilinidae and in the peristome of Haswcllia, Adconella elc. Uncalcified spots in calci- 

 fied surfaces may be called wpseudoporesw. 



Ascopore. A pore leading into the compensation-sac. 



