SYNOPSIS, 

 t 1 1 1 1 Cells oil ringed footstalks. 



page. 



Polypidoms eonfervoid; cells campanulate ; stem} 



jointed, cells rising from thickened parts of >■ Laomedea . . 37 

 the stem S 



40 



Polypidoms eonfervoid ; cells campanulate, contin- ) ~ 



uous with the stem, irregular \ Campakularia 



* * * Polypidoms internal* 

 t Horny, rooted. 

 Arborescent, fleshy, warty, with star-shaped de- ) 



pressions, rooted . . . . . , . . } 60*00*14 • • 55 



t t Bony, free. 



Polypidom linear, feathered at one end .... Pennatula . . 55 



Polypidom linear, with curved lines on either side. Virgularia . . 55 



* * * * Polypidoms external, calcareous. 

 Columnar or conical, upper surface lamellated . . Caryophyllia . 71 



Arhorescent, or foliaceous, stout ; cells immersed, ) u lor . 



quincuncial, on the upper side only . . . ] ^etepora . . IdU 



Arborescent, or foliaceous, cells immersed, quin- ) T , 1Q1 



cunical, oval ; cells on all sides .... . ^ SCHARA . . . lcfl 



Arborescent, jointed, cylindrical, cells immersed, i „ lrtn 



quincuncial, rhomboidal; cells on all sides . . \ * ARCIMIA - • • l & 

 Arborescent, cells oval, distinct and irregularly ) 0 



heaped . . . . ! . . . ] Cellepora . . 109 



Arborescent, eonfervoid, jointed ; cells tubular, ) Q _ 



apertures ronnd, terminal. CRISIA * • • • 97 



Arborescent, eonfervoid, jointed ; cells oblong, \ r 10 „ 



apertures opening on one plane $ ^ellularia . . 1^0 



Arborescent, eonfervoid, jointed ; cells sub-cylin- } 



drical in pairs, apertures lateral and sub-ter- > Notamia . . . 100 



minal ) 



Polypidoms creeping, cells erect, spathulate, aper- > . , nrt 



tores sub-terminai ..........] Anguinaria. . 102 



Encrusting, cells tubular, of equal diameter, dis- ) ^ inn 



tinct, sometimes ramous . \ Tubulipora. .103 



Encrusting, cells tubular, of equal diameter, co- > , 



alescent . \ Discopora . . 108 



Encrusting, cells elliptical, linked together like beads Hippothoa . . 101 



Encrusting, cells oval, with contracted terminal > T , , „ 



apertures \ Lepralia. . . 113 



Encrusting, cells oval, with calcareous or ossified) «, 



rims, apertures patulous \ Membranipora. 118 



Encrusting, cells quadrangular or hexagonal . . . Flustra . . . 121 



***** Polypidoms spongy. 



Cells immersed, irregular, with contractile apertures Alcyonidium . 132 



Cells in tubes Crystatella . 



