734 Henry B. Ward, 



by tlie rosette is just that which would we produced by the excessive 

 contraction of a long- thin-walled tube uuder the influence of a set 

 of longitudinal muscle fibres inserted at various points along its 

 course while the funnel form represents a stage of contraction inter- 

 mediate between the long- tube and the convoluted rosette. Finally 

 Lönnbekg evidently had raore favorable conditions for observing 

 the living animal than did Watson as is clearly shown in the records 

 of the activities observed by these two investigators. No doubt 

 this was in part due to temperature which Watson says is the most 

 important factor in keeping the worms in good condition for study 

 since "in warm weather they remain active for only a very short 

 time". 



The discussion of the reproduction System and of the differen- 

 tiation of species in the genus Gyrocotyle is reserved for a later 

 paper. 



