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Materials and Methods
Origin of the Reproductive Tract Primordia
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18 weeks albumen gland Basommatophora blind outpocketing body cavity Brock cells connective tissue diameter dioecious distal end distal portion ectodermal eggs embryology Entwicklung Entwicklungsgeschichte epithelium Erlanger female canals female components female duct system female genital pore female tract flexure freshwater pulmonates gastropods genital duct genital tract germ layers give rise gonad grows posteriorly hatching Helix hermaphroditic duct hermaphroditic gland inner end Jhering Klotz Limax maximus lobes longitudinal splitting lov.er lower duct lower vas deferens lumen Lymnaea ovatus Lymnaea stagnalis appressa male and female male duct male tract mantle cavity mesodermal middle section mouth observations original invagination oSthecal gland ovotestis Paludina penis sheath posterior end preputium anlage primary invagination primordium prosobranch prostate gland putium reproductive system right tentacle Rouzaud rudiment secondary branch sections farther seminal receptacle seminal vesicles spermatogonia stage stagnalis appressa Say structure thesis tion upper duct upper tract uterus v.ith vagina wiss young snails Zeitschr Zool