Tiss"es, evolution of, [19]

Tiss"es, notochordal, [435]

Tiss"es, two groups of, [463]

Tongue of Ammocœtes, [246], [303]

Tonsils, [427], [430]

Torpedo, [262], [392], [470]

Trabeculæ, [121], [132], [133], [145], [277], [295], [377]

Transformation of the Lamprey, [18], [35], [59], [61], [125], [168], [193], [199], [200], [220], [227], [228], [287], [291], [304], [307], [309], [331], [336], [347], [349], [389], [445]

Tremataspis, [32], [75], [275], [326], [351], [352]

Trilobites, [24], [25], [26], [437]