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== The Pin-Worms ==
=== General Apperance ===
*Non-bursate.
*Female tail long and tapering.
*Pharynx is double-bulbed.
=== General Life-Cycle ===
*Direct and non-migratory.
*Live in the large intestine.
*Eggs are deposited on perineal skin.
*Eggs are asymmetrical and have an operculum at one end.