Synapse, [72]
Syncytium, [464], [471], [479]
Tail of lizards, [50]
Tapetum, [69]
Teleosteans, [23], [345], [420], [424]
Tendon-organs, [470]
Tentacles of Ammocœtes, [246], [289], [303]
Tergo-coxal muscles, [247]
Test, biological, of relationship of animals, [492]
Thalainencephalon, [48]