Tadpoles, arrested development, 607.
Tegetmeier, W. B., metamorphosis of _Siredon_, 566.
Teleology and Mechanism, 694.
_Terebrantia_, larvæ, 508.
Transformation, causes of, 460, 496;
factors of, 676.
_Trematoda_, alternation of generations in, 83.
Trimen, Roland;
larva of _Lopho. Dumolinii_, 527;
of _Ch. Capensis_, 529;
phytophagic variability of larva of _Ach. Atropos_, 531.
_Triptogon roseipennis_, larva, 244.
_Triton_;
_T. alpestris_, sexual larva, 585;
reproductive larvæ, 590.
Degeneration in genus, 612.
Species of Upper Engadine, 631.
Typical parts, modified by environment, 501, 513.