| Description | Slide shows six diagrams illustrating the 'heads of various polychaeta'.
Each diagram is labelled with Roman numerals and letters which are explained in the following key:
'Fig 134. - Heads of various polychaeta (diagrammatic). A, polynoid; B, Syllid; C, Nephthys; D, Eunice; E, Phyllodoce; F, Trophonia: a, prostomium; c, normal cirrus; c', peristomial cirri; c2, cirrus of second segment; c3, cirrus of third segment; el1, point of attachment of elytron; p, palp: s, nuchal organ (ciliated pit); t, tenatcle; I, peristomium; II, III, IV, segments.' |