Seaswallower, by Greg Ferrell   Biol 3 Home Page  

It turns out that these beasts are extremely electrical by nature; far beyond any electric eel hear on earth, relatively speaking. The circular spinal column is responsible for the current loop between the brain and the sonar transmitter as each "talks" to one another. This loop generates and alternating current (AC), which essentially means that the flow of charges changes directions thousands of times per second. These charges are generated by potassium and calcium ion channels, much like our own spinal chord. Centered within this giant oval is a second current loop generated in a similar fashion. This loop is strongly attached and wrapped around the spinner. However, this is only a singular current (SC), meaning it flows only in one direction. It is the combination of these two current loops which generates the necessary  magnetic fields and forces that makes the spinner spin.

Magnetic fields and forces