-------- gibbosa, [397], [412].
Trigonocarpum Nœggerathi, [149].
------------- olivæforme, [149].
Trilobites, [532].
----------, geological distribution of, [543].
Trinucleus Lloydii, [538].
Trionyx, [727].
Triplosporite, [142].
Trochites, [284].
Trochus ziziphinus, [385].