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"A., a minute portion of the branched excretory system of a Plathelminth, showing longitudinal duct (I), with cilia (C.), its branches (II and III), and the terminal flame-cells (IV)." -Thomson, 1916

Plathelminth

"A., a minute portion of the branched excretory system of a Plathelminth, showing longitudinal duct…

"B., one of the characteristic hollow flame-cells, leading into the excretory tubule (1), showing the long cili (2), the excretory globules (3), the nucleus (4), and pseudopodia-like processes (5) passing among adjacent cells." -Thomson, 1916

Plathelminth

"B., one of the characteristic hollow flame-cells, leading into the excretory tubule (1), showing the…