The foot is always simple, with its flat crawling surface extending from end to end, but in the embryo Limnaea it shows a bilobed character, which leads on to the condition characteristic of Pteropoda.
Ing gs, the bilobed arch sh, The primitive shell-sac or enteron or lateral vesicles shell-gland Â° of invaginated endoderm, pi, The rectal peduncle or whichwill develop into liver.
The young foot shows a bilobed form.
The mass of the arch-enteron or invaginated endodermal sac has taken on a bilobed form, and its cells are swollen (gs and tge).
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