It had apparently the perivisceral cavity and nephridia of the schematic worm, and a circulatory system.
The function of the nephridia is to carry off waste matter from the fluid which fills the body-cavity.
They consist as a rule of but few segments to most of which a pair of nephridia belong.
Note the delicate membranous dark-colored sac on the floor of the pericardium, the kidneys or nephridia.
The nephridia are not easily distinguished, though they are very numerous.
There are two organs, serving the function of kidneys, placed dorsally one upon each side of the body (nephridia).
The addition of a primitive vascular system and a pair of nephridia, or excretory organs, is first met with in the Nemertines.
This now creeps along the body of the female and takes up its home in her nephridia.
nephridia in two series; large, anterior nephridia followed by small, short tubes in abdomen.
Portion of segmental organ of 4th and 5th legs, corresponding to vesicle of the other nephridia.
nephridium ne·phrid·i·um (nə-frĭd'ē-əm)
n. pl. ne·phrid·i·a (-ē-ə)
The embryonic excretory organ from which the kidney develops.