Codosiga, [111]
Coelenterata, [243] f.;
definition, [245];
almost all immune from Gregarines, [99]
Coeliac canal of Antedon rosacea, [586]
Coelogorgia, [349]
Coelogorgiidae, [349]
Coelom (including body-cavity), [428];
of Asterias rubens, [437];
of arm of Ophiothrix fragilis, [480];