PEDICELLINA NUTANS. 



569 



I have met with no British form agreeing 

 Belgica of Van Beneden, which is cha- 

 racterized by the smoothness of the 

 stem and the curious knots or enlarge- 

 ments at its base and in its course, and 

 which seems to have a more regularly 

 shaped body than P. cernua. Tiie figure 

 is accompanied by a very brief and insuf- 

 ficient diagnosis. 



Habitat. On Algee. 



Localities. Scotland (Dalyell) : Tenby 

 (Leipner). 



Pedicellina mitans. 



Fig. 40. 



Pedicellina nutans * 



Pedii-ellina cernua * . 



* These two figures are drawn to the same scale. 



