Slide showing two diagrams of 'Nereis diversicolor Mull, head with buccal region everted'. Slide shows two diagrams of 'Nereis diversicolor Mull, head with buccal region everted.' Images are labelled 'A' and 'B' with further labelling which is explained in the key. Title below image reads: 'Fig. 125 - Nereis diversicolor Mull x 4, head with buccal region everted. A, Dorsal view ; B, Ventral view. a, Prostomium ; B, Everted buccal region ; c, c', Peristomial cirri, 1, 2, 3, 4 ; d, Denticles or paragnaths ; e, eyes ; E, lower lip ; P, Palp in A, entrance to pharnyx in B ; J, jaw ; T, tentacle ; I, perestomium ; II, foot of apparent second segment.' Late 19th to early 20th century