358 



ASAJIEO OKA; ON THE SO-CALLED 



dinm is a colourless duct, which presumably has no excretory 



function It seems to me certain that the two nephridia open 



independently, their apertures occurring in the depression of the 

 vestibular floor situated behind the epistome ; there can be no doubt 

 that the nephridia open to the exterior in front of the ganglion." He 

 believes, further, the proximal cell to be a flame cell, although he coidd 

 not ascertain it |)OsitivelY. 



The account of the nephridia of Pedicel! ina given by Foettingeii 

 is nearly the same as Harmer's, but differs from it as regards the 

 mode of opening of the tubes. Instead of opening independently 

 as in Loxosoiua, these tubes unite in Fedicellina at a certain distance 

 from the external orifice, which is found at the bottom of an infundi 

 buliform depression. He adds, " J'ai pu, sur des coupes verticnles 

 passant par les faces latérales du calices, m'nssurer de la, ï'Mpiv 

 la plus positive que les deux cannux segmentaires, chez le maie et 

 chez la femelle, possèdent une portion commune, impaire et médiane, 

 débouchant à l'extérieur." As to the nature of the proximal cell, he 

 remarks, "chez P. echiiiata, tout aussi bien que chez P. Benedeni et que 

 chez P. hehjica, la cellule terminale possède un faisceau de longs cils 

 s'entjfaii'eant assez loin dans le canal." 



According to my observations, the ne[)hridia of BarcnUia imsa- 

 kiensis seem to stand intermediate between those of the two genera 

 already investigated, in the manner of opening externally. Here the 

 tubes unite before they open to the exterior, as I have stated elsewhere 

 (1895a), but not at such a considerable distance inward as in Pedicelliiia 

 helijica. They coalesce, rather, almost at the place, where they o])en 

 into the funnel-shaped pit of the body-wall mentioned l)y Haidier and 

 FoETTiNGER, SO that the unitubular ])ortion of the nephridia is extremely 

 short. In this respect the description of Juliet applies completely to 

 our species ; " l'observation de l'objet vivant avec un grossissement 



