TERMINOLOGY 



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



Zooecium (= autozocecium). A chamber in which a polypide is or has been lodged. 



Heterozooecium. 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 ))flagellum«. 



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

 and no aperture. 



Gonozooecium. A modified zocecium set apart for reproductive functions. 



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



Gymnocyst. A calcified part 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 crj^tocyst arising from the vertical walls may be called a ))primary« 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 fine 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 communication between all the members of the colony. 



Pore-chamber. A small space situated in the boundary between two walls of a zooecium, 

 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 different calcareous surfaces. In the present work such uncalcified spots 

 are sometimes (e. g. in the Catenariidae) called »excisions«, ))perforations«, »fissures(( or 

 »fenestrae«, 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 HaswelUa, Adeonella etc. Uncalcified spots in calci- 

 fied surfaces may be called »pseudopores«. 



Ascopore. A pore leading into the compensation-sac. 



