Plate 1. 



Fig. 1. Scolex of Dinobothrium plicitum, from Carchnrodon carcharias. Fi'ont view ; 

 outline from specimen mounted in balsam ; details addetl from alcoholic speci- 

 mens. Breadth of scolex in front 2.5 mm. 



Fig. 2. Dinobothrium planum, from Cetorhinus maximvs. Front view of scolex. 

 Length of bothrium 7 mm . 



Fig, 3. Scolex of Dinobothrium planum. Marginal view. Length of bothrium 

 7 mm. 

 10 



