Gross morphology and histology of nephridia in four species of polychaetes

In a recent paper (Krishnamoorthi, 1962) it was shown that the four polychaetes studied, viz., Glycera embranchiata Ranganathan, Onuplzis ertmita , Loimia medusa Savigny and Clymene insecta Ehlers, exhibited differences in their capacities for volume regulation when subjected to stresses of anisotonic media. Jurgens ( 1935). Beadle (1937) and Ewer and Ewer (1943) have brought evidence of the relative importance of excretory organs in the volume regulation of the polychaetes they had studie