CONTENTS. 



Paee. 



Historical account 113 



Description of scolcx. cyst and blastocyst 114 



Distribution and number of cysts in butterfish 115 



Details of examinations of butterfish for cysts 1 16 



Habitats of the parasite . 122 



Adult stage - 122 



Encysted stage 122 



Effect of the presence of cysts on weight of host 125 



Life history of the parasite - 126 



Special case of butterfish and hammerhead shark 127 



Food of hammerhead shark 127 



Food of 1 mtterfish 127 



Economic considerations 128 



Problems suggested 130 



Explanation of plates 131 



112 



