Diagram of position and structure of pleurembolic proboscis inverted in head (on left) and everted out of the head (on right). Eversion, with attenuation, can extend as far as 150% length of shell.
True mouth (1). Rhynchostome (false mouth) (2). Buccal mass with short radula (3). Proximal base of proboscis (4). Oesophagus (5). Exterior of proboscis when everted indicted with green. Based on diagram in Frettter and Graham (1962).
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Sets of OTHER SPECIES:
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