(from Coe, W. R. (1905). Nemerteans of the west and northwest coasts of America. Bull. Mus. comp. Zool. Harv.. 1-318)
Parasitic nemerteans characterized by short, stout, much flattened bodies of leech-like appearance and movements, and provided with largerounded sucker at posterior end. Mouth and proboscis open close together or into a common atrium at the emarginate anterior end of body. Head not demarcated from body, without lateral grooves. Ocelli and cerebral sense organs wanting.
Proboscis sheath extends to posterior opening of intestine; proboscis slender, without stylets, but having a specialized bulb which apparently represents the degenerated stylet apparatus.
Intestine without diverticula, slender, convoluted, longer than body and opening posteriorly at base of sucker. Body parenchyma very voluminous.
Parasitic in branchial cavity of various species of marine lamellibranchs.
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