S3 2 POLYZOA 



Zooecia in one or few series, forming a linear or branched colony, 

 which is closely adherent, but may give rise to short erect 

 portions. Branches narrow, but often broadening at their ends. 

 Zooecia usually with a free upper end . . Ktomatopora 



Colony broadly lobed, some of the zooecia in transverse or oblique 

 ridges composed of contiguous zooecia, arranged like a row of 

 organ-pipes .... Idmonea serpens 



Colony broadly lobed, or fan-shaped ; zooecia in many series, which 

 are not arranged like organ-pipes . . . Tubulipora 



fi _ f "Well branched. Oritices confined to one surface of the colony . 70 

 ' \ Not much branched . . . . . .71 



Zooecia in transverse rows, their upper ends united in the manner of 

 a row of organ-pipes. Ovicell (when present) an inflation of the 



70. -! front of the branch . . . Idmonea atlantica 



Zooecia not in regular transverse rows. Ovicell (when present) large, 

 { mostly on the back of the branch . . . Horneru 



f Branches cylindrical, their ends massive and raised into radial 



71. -j ridges, which carry the orifices . . Domopora stellata 



[ Ends of zooecia tubular, arranged all round the branch. Entalophora 



Ctenostomata. 



f Colony entirely adherent, or forming thick, soft, erect lobes . 73 



72. 1. Colony erect, well-branched, dark and opaque, resembling seaweed. 



[ Zooecia with a long tubular free portion . Anyuinella palmata 



| Orifice large, with two distinct lips. A variable number of stout, 



brown spines. Encrusting . . . Flustrella hispida 



Orifice small, rounded, borne by a more or less distinct papilla. 



73. -; Encrusting or erect. Zooecia crowded, rarely in single lines. 



IAlcyonidium 



Orifice small, rounded. Zooecia widely separated, connected by 

 narrow tubes ..... Arachnidium 



J Axis of colony erect, usually branched . . .75 



' ' ( Axis creeping . . . . . . .79 



,_ r f Zooecia in elongated clusters, which occur at intervals . . 70 



\ Zooecia not grouped ; or in irregular groups ; or in whorls . 78 



f Zooecia regularly biserial . . . . .77 



76. -I Zooecia long, less regularly arranged. Polypide with a gizzard. 



[ iiovxrbankia (Fig. 238) 



Clusters of zooecia very regular, occurring immediately below a 

 bifurcation of the axis. Zooecium with a broad base, not movable. 



Amathia lendiyera 



Zooecia arranged like the pinnules of a leaf, with a constricted base, 

 and movable on the branch . '. . Mimosella yracilis 



J 



