Slide showing diagram of a 'Sabellaria alveolata.' Slide shows diagram of a 'Sabellaria alveolata.' Diagram is labelled and explained in the following key: Fig. 135 - Sabellaria alveolata L. ventral view of anterior region, x10. a, Notopodial cirrus; b, notopodium; c, neuropodium; ch, peristomial chaetae; d, neuropodial cirrus; m, mouth; P, multifid palp (gill filaments); P', ridges after removal of gill filaments; s, ventral (tubiparous) gland shield; T, tentacle; I, hood formed by peristomium; II to VI, following segments.' Sabellaria alveolata: honeycomb worm. Late 19th to early 20th century