Tripedalia cystophora, [319]
Tripedaliidae, [319]
Triplechinoid type of ambulacral plate, [531], [539]
Tripod, [83];
-shaped spicule of Radiolaria, [76]
Tripolis, [87]
Tripylaea, [76]
Trivium, of Echinarachnius parma, [543];
of Holothuria nigra, [561]
Trochammina, [59]