PARASITES OF FISHES OF BEAUFORT, NORTH CAROLINA. 337 



rHooks inconspicuous, of densely fibrous structure Thysanocepkalum 



iHooks chitinous, structureless Jl 



rHooks simple 22 



IHooks compound 23 



rBothria without auxiliary suckers Onchob 



IBothria with auxiliary suckers anterior to la inks Calliobothrium 



fScolex Battened, bothria in pairs, hooks in pairs united by a chitinoua bar Platybothrium 



[Bothria cruciform 24 



f Honks with two prongs each, bothria costate icanthobothrium 



IHooks with three prongs each, bothria loculate at posterior cud Phon iobothrium 



[Bothria two 26 



\Bothria four 27 



rBothria without auxiliary pits Rkynchobothrium 



\Bothria with auxiliary pits Otobothrium 



rBothria lateral Tetirarhynchus 



IBothria terminal Synbothrium 



B.B.F.1904— 22 



