On a New Bothriocephalus and a New Genus of Proteocephalidae from Indian Fresh-water Fishes

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Abstract
1. A new species ofBothriocephalus—B. pycnomerus—is described from the intestine ofOphiocephalus maruliusHam. Buch., from the Ganges and Jumna at Allahabad, India.2.B. pycnomerusclosely resemblesB. histiophorus(Shipley 1901; from the marine sword-fishHistiophorus) in structure but differs chiefly in the possession of an armed scolex and its crowded indistinct segmentation.3. Lühe's definition of the genusBothriocephalusmust be amended to include forms with armed scolices and forms in which the ventral uterine apertures are a-median and irregularly alternate.4. Two new species of Proteocephalidae are described which possess armed muscular rostella, and for these a new genusGangesiais created and defined. The definitions of the Order Tetraphyllidea (Lühe 1910) and of the Family Proteocephalidae (La Rue 1914) must be amended to include forms possessing muscular rostella, armed or unarmed.5. These two new species—Gangesia wallagoandG. macrones—were found in the intestines ofWallago attuBleek andMacrones seenghalaSykes (both Siluroids) respectively, from the Ganges and Jumna at Allahabad.6. Southwell's “Ophryocotyle bengalensis,” fromOphiocephalus striatus, Labeo rohitaandWallago attu, is probably identical withGangesia wallago.