II. The Plpaiula-like Larva 

 III. Formation of tlie iviouth 

 IV. The Eight Tentacle Stage 

 V. The Sixteen Tentacle Stage 

 VI. The Complete Scyphistoma 

 VII. The Strobila 



Development of the Rhopalia 

 Other Phenomena of Strobilization 

 VIII. The Ephyrula 

 IX. The Later Stages 



CONCLUDING RMIARKS 



LIST OF PAPERS REFERRED TO 



EXPLANATION OF THE FIGURES 



VITA. 



