OBSERVATIONS ON CERCARIÆUM LINTONI MILLER AND NORTHUP AND ITS METACERCARIAL DEVELOPMENT

Abstract

C. lintoni (from Nassa obsoleta) and its metacercarial stage (which develops in Nereis virens) were studied and compared with different adult trematodes in an effort to complete the life cycle. In Nereis virens infection was obtained by exposure to active cercariae. By cutting off parapodia, numerous metacercariae of known age were obtained (dissection being done under a binocular microscope). One clam worm supplied material for several studies. During development of the metacercariae, some of the larval characters disappeared with the appearance of adult characters. The metacercariae had some characteristics of the family Haplo-poridae and some of the family Zoogonidae. Neither the adult stage nor the adult host was found.