of Echinoidea, [512]

Eye-spot of coloured Protista, [21], [125] f.

Fascicularia, [348]

Fasciole, of Echinocardium, [550], [555];

of Spatangoidea, [553];

of Spatangus, [553];

of Eupatagus, [553];

of Spatangidae, [555]

Fats, fatty acids, [15];

in Flagellates, [110], [115];