Internal structures of the Nemertini
This image shows the internal structures of a basic nemertean, including the proboscis and the rhynchocoel: 1: Proboscis 2: Rhynchocoel 3: Dorsal commissure of brain 4: Rhynchodeum 5: Proboscis pore 6: Ventral commissure of brain 7: Mouth 8: Foregut 9: Stomach
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"Nemertea Anopla n Enopla Head Sagittal."
http://en.wikipedia.org/wiki/File:Nemertea_Anopla_n_Enopla_Head_Sagittal.png
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