e x p l a n a t io n o f PLATE X.
The last Plate represents the caudal heart or
ventricle seen at the extremity of the eel.
It is a palish sack. The distribution of the
adjacent vessels, and the course of the blood
in them, are distinctly represented.
In smaller eels, another vessel is seen descending
near the spine.
The minute anatomy and connexions of this
singular organ still require to be investigated.
