excretory

One of the prominent openings admits the food and the water required in respiration, the other is the excretory aperture.

The excretory organs of Elasmobranchii have also formed the subject of some investigations by Dr Meyer and by myself.

In the remaining parts of the excretory organs the two species of Scyllium resemble each other very closely.

This difference accounts for two facts which were mentioned in connection with the excretory organs of the adult, viz.

The general features of the excretory organs at this period are diagrammatically represented on the woodcut, fig. 6.