TUBULIPOEAD^. 7 



POLYZOA. 



Molluscous animals enclosed in cells, organically 

 associated, and originating from a single cell ; 

 digestive system provided with a receiving and a 

 discharging orifice, placed near together; mouth 

 sm-rounded by ciliated tentacles ; reproduction by 

 ciliated free-swimming ovules. 



Order L INFUNDIBULATA. 



Tentacles forming an uninterrupted funnel- 

 shaped crown around the mouth. Exclusively 

 marine.* (Order II. Hip2)ocrep{a, consists exclu- 

 sively of fresh- water species.) 



Cell with a round simple orifice .... Ci/clostomata. 



Cell-orifice filled with a thin, membranous, 

 or calcareous plate, with a curved mouth, 

 furnished with a moveable lip Cheilostomata. 



Cell-orifice surrounded by a fringe of 

 bristles (more or less developed) when the 

 animal is protruded Ctenostomata, 



Siib- Order I. GYCLOSTOMATA. 



Polyzoary calcareous, massive, circular, 

 lobed, or di^dded dichotomously ; cells long 

 and tubular, with a round, prominent, un- 

 constricted orifice Tuhulijiorada. 



Polyzoary plant-like, jointed, branched ; 

 cells tubular, disposed in one or two series, 

 with round orifices looking to opposite sides Crisiadcs. 



Family I. TuBULiPORADiE. 



TuhuUpora (Lamk.). Wart-like, with a defined 

 base ; cells sub-erect, aggregated, or in imperfect 

 rows, more or less free at the tip. 



* With the exception of PalucUcella aHiculata, a species found 

 in the loughs of Ireland, Avhich appears to belong to this Order. 



