Sea urchins - The Digestive System in the Nine Phyla
Sea Urchins' Teeth and Aristotle's Lantern - The Living Coast Discovery Center
Aristotle's lantern
ECHINOID TERMINOLOGY
What traits do you think the following organisms all share in common? Use the defining characteristics of fish that you just learned to help guide you. - ppt download
Aristotle's Lantern(Topic of B.Sc. 2nd Sem) - YouTube
Bionic Model of Aristotle's Lantern by Giorgio Scarpa — Demo 2 - YouTube
The Echinoid Directory - Natural History Museum
Aristotle's Lantern from a green sea urchin" by Edna W. Lawrence Nature Lab