page. 

 . 37 



Campanularia . 40 



55 



SYNOPSIS. 



t 1 1 1 1 Cells on ringed footstalks. 



Polypidoms confervoid ; cells campanulate ; stem 1 



jointed, cells rising from thickened parts of V Laomedea 

 the stem 3 



Polypi<loms confervoid ; cells campanulate, contin- 

 uous with the stem, irregular 



* * * Polypidoms internaU 

 t Horny, rooted. 

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



pressions, rooted 5 



t t Bony, free. 

 Potypidom linear, feathered at one end .... 

 Polypidom linear, with curved lines on either side. 



* * * * Polypidoms external, calcareous. 



Columnar or conical, upper surface lamellated . . 



Arborescent, or foliaceons, stout; cells immersed, 

 quincuncial, on the upper side only ... 



Arborescent, or foliaceous, cells immersed, quin- 

 cnnical, oval ; cells on all sides 



Arborescent, jointed, cylindrical, cells immersed, 

 quincuncial, rhomboidal; cells on all sides . . 



Arborescent, cells oval, distinct and irregularly 

 heaped 



Arborescent, confervoid, jointed ; cells tubular, 

 apertures ronnd, terminal. ....... 



Arborescent, confervoid, jointed ; cells oblong, i 

 apertures opening on one plane j 



Arborescent, confervoid, jointed ; cells sub-cylin-' 

 drical in pairs, apertures lateral and sub ter- 

 minal 



Polypidoms creeping, cells erect, spathulate, aper- ; 

 tures sub-terminal 



Encrusting, cells tubular, of equal diameter, dis- 

 tinct, sometimes ramous 



Encrusting, cells tubular, of equal diameter, co- 

 alescent 



Encrusting, cells elliptical, linked together like beads 



Encrustiug, cells oval, with contracted terminal " 

 apertures 



Encrusting, cells oval, with calcareous or ossified 

 rims, apertures patulous 



Encrusting, cells quadrangular or hexagonal . . 

 ***** Polypidoms spongy. 



Cells immersed, irregular, with contractile apertures Alcvonidium 



Cells in tubes CavsTATEi-LA 



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