CONTENTS. 



PAGE 



Introductory observations ... .1 



On the structure and affinities of the POLYZOA . . .1 



Synopsis of primary divisions . . . . 8 



Of the CHEILOSTOMATA . . . .9 



,, Synoptical classification of . .12 



Tabular view of . 18 



CELLULARIIDjE ..... 19 



Scrupocellaria . . ... .19 



scruposa .... 19 



SALICORNARIID^: . . . 20 



Salicornaria . .... .20 



,, crassa ........ 22 



,, sinuosa . . . . . . . .23 



Hippothoidae .... 24 



Hippothoa . . . . 24 



Patayonica . . ..... 24 



abstersa . . . . . . .25 



dentata ..... 25 



Alysidota . . ... 26 



lubrosa ....... .26 



catena . . . . . . . .27 



MEMBKANIPOJUD* ........ 27 



synopsis of genera . . 27 



Membranipora ..... .28 



synopsis of species . 29 



Membranipora tubercidata . . 30 



,, monostachys . . . . . . .31 



,, Savartii . . . . . . .31 



dubiu . . .31 



