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680 proposed to call Filaria nocturna; but as, in accordance with the rules of zoological nomenclature, precedence must be given to the name previously suggested by Cobbold for the adult form, I propose to call the larval form microfilaria bancrofti (Fig. 96, a). The other filariæ of the blood I named F. diurna



(mf. loa), Fig. 96, b; F. demarquaii (mf. demarquaii), Fig. 96, c; F. ozzardi, (mf. ozzardi), Fig. 96, d (a doubtful species); F. perstans (mf. perstans), Fig. 96, e; and F. magalhãesi, after its describer. (Plate X.)

Their pathological importance.—Only one of these parasites, so far as we know at present, appears to