Fig. 128.—A, Scheme for the measurement of certain fixed points of structure in microfilariæ, of value in the diagnosis of species. B shows that even in a shrunken specimen the measurements retain their same proportionate value. (After Fülleborn.)

Measurements: 1, From the ant. extremity to the nerve ring (N.); 2, to the middle of the excretory pore (Ex.P.); 3, to the nucleolus of the excretory cell (Ex.Z.); 4, to the nucleolus of the genital cell (G.1); 5, to the middle of the anal pore (A.P.); 6, to the terminal tail nucleus.