Tentacles, of Ascidians, [44];

of Amphioxus, [116]

Test, [40], [63];

of Appendicularians, [65]

Testa-cells, [56]

Tethyum, [36]

Tetragonopterus, [575]

Tetragonuridae, [642], [637]

Tetragonurus cuvieri, [642]

Tetranematichthys, [589]