CONTENTS. 



PAGE 



PREFACE iii 



PROTOZOA 



Amoeba I 



Paramcecium 3 



CCELENTERATA 



Leucosolenia 5 



Grantia 9 



Campanularia 12 



Pennaria 17 



Metridium 19 



Cyanea 23 



Mnemiopsis 26 



ECHINODERMATA 



Asterias 29 



Arbacia 33 



Thy one 36 



VERMES 



Bdelloura 39 



Nereis 42 



Bugula 47 



Phascolosoma 51 



V 



