Slide showing two diagrams illustrating the 'two sexes of Autolytus Prolifer'. Slide shows two diagrams illustrating the 'two sexes of Autolytus Prolifer'. The two diagrams are labelled 1 and 2, each diagram is individually labelled with other letters explained in the following key: 'Fig 384. - the two sexes of Autolytus Prolifer. 1, female carrying its sack of eggs (Sacconereis helgolandica Muller). 2, male (Polybostrichus Mulleri Kef.). a antennae; b first pair of dorsal cirri; c bifurcated palps of the male; d normal dorsal cirri; e median antenna of male; f tenatcular cirri. (From Perrier).' Autolytus Prolifer is a type of segmented worm. Late 19th to early 20th century