Transverse flagellum and groove, in Dinoflagellata, [110], [130] f.;
multiple, in Polykrikos, [132]
Transverse (= tentacular) plane, [414]
Transverse section, of the arm of an Asteroid, [443];
of the arm of an Ophiuroid, [480];
of the radius of an Echinoid, [518];
of the radius of a Holothuroid, [562];
of body of a Holothuroid, [563];
of arm of Antedon, [586]