of Echinus esculentus, [516];
of Holothuria nigra, [562];
of Antedon rosacea, [585];
development of first rudiment in larva, [605];
subsequent development in Dipleurula, [608], [609];
in Asterina gibbosa, [611];
in Antedon rosacea, [618], [619]
Coelomic nervous system, of Asterias rubens, [448];
of Ophiothrix fragilis, [488];
of Echinus esculentus, [524];