Amalthea (Fam. Corymorphidae, [273]), [266]
Ambulacral area, of Echinarachnius parma, [544];
of Echinocardium cordatum, [550]
Ambulacral groove, of Asteroidea, [432];
representative in Ophiuroidea, [481];
representative in Echinoidea, [515];
of Pelmatozoa, [579];
of Antedon rosacea, [581], [582], [587];
of fossil Crinoidea, [595];
of Thecoidea, [596];