Slide showing two diagrams, one of a 'Nereis pelagica' and the other of the chaetae of Nereis. Slide shows two diagrams, one of a 'Nereis pelagica' and the other of the chaetae of Nereis. Title below left diagram reads 'Fig 122. - Nereis pelagica. L, natural size. (From Ehlers).' Title below right diagram reads 'Fig 123 - Chaetae of nereis; enlarged. A, from neuropodium; B, From notopodium of N. diversicolor; C, swimming Chaeta of Hetero-nereid stage of N. dumerilii.' Late 19th to early 20th century