Abstract
The life cycle of Lepocreadium setiferoides (Miller and Northup) has been experimentally traced. The rediae and cercariae develop in the snail, Nassa obsoleta; the cercariae encyst in annelids of the genus Spio and the turbellarian, Procerodes warreni; and the adult worm develops in the intestine of sand dabs and flounders. The structures of the various stages in the life cycle are described.The anatomical features and most of the life cycle of Cercaria cumingiae n. sp. are described. The sporocysts and cercariae develop in the digestive gland of the bilvalve, Cumingia tellinoides. The cercariae encyst in the siphons, foot, and other organs of this mollusk. The adult worm probably develops in some fish. From the nature of the excretory bladder, the flame cell pattern, and the location of the genital primordium, it is believed that this trematode belongs to the family Allocreadiidae.
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