fission in, [281];
tubes, [290]
Fimbria tenuis, [157]
Fischer, on branchiae in Gephyrea, [416] n.
Fishes, Trematodes of, [4], [53], [55], [62], [64], [71], [72];
Cestodes of, [77], [84], [85];
Nemathelminthes of, [142], [143], [149], [163], [173], [182]
Fission, in Bipalium, [34];
in Planariae, [40];
in Trichoplax, [96];