A HISTORY OF NORFOLK 2. Sagartia bellis (Ell. & Soil.) the ' daisy.' Body-wall smooth, studded with suckers in its upper portion, and pierced with loopholes for the ejection of stinging-threads. Disc broad and slightly wavy at the margin ; ten- tacles numerous. Colour of disc dark brown or black, with radiating lines of a diflFerent colour, generally red ; the disc and tentacles together generally present a stellate pattern, caused by the regular alternation of groups of tentacles of two contrasted colours. Off Hasborough, on Sabellaria ground (P.). This and the next species are the only Sagartians recorded for Norfolk waters, but S. viduata almost certainly occiirs. This species is distinguished by the greatly elongated column, marked with vertical brown stripes, and the slender, very flexible tentacles marked on each side with a long dark brown line. It adheres to rocks and loose stones between tide- marks and in shallow water. 3. Chitonactis coronata (Gosse). This species was wrongly referred by Gosse to the genus Bunodes, owing to the tubercula- tion of the body-wall. Unlike Bunodes, how- ever, this species possesses sting-threads. The warts are almost confined to the upper region of the column, in twelve vertical lines as well as irregularly scattered. A distinct groove and
- parapet ' separate the disc from the column ;
the tentacles are very short (shorter than the radius of the disc) ; and the body-wall secretes a deciduous epidermis. It is widely distributed over the North Sea in the deeper water, and was dredged by the Pommerania off Hasborough, on Sabellaria ground. 4. Tealia crassicernis (O. F. Mailer). Column squat, with an expanded base, ir- regularly studded with rigid tubercles which act as suckers ; tentacles short, inflated, coni- cal, general banded or broadly blotched. Colours dull crimson, or dull green with crimson markings. In tide-pools, crevices of rock or masses of Sabellaria tubes. Off Has- borough (P.). IV. CH.ETOPODA Segmented worms, provided with lateral tufts of bristles or hooks for locomotion. A. Nereids Elongated worms with tentacles and pro- minent foot-lobes ; active, rapacious. I. Nereis diversicolor, Mull. The common harbour or * rag-worm,' 3-4 inches long. Distinguished by two diverg- ing brown bands immediately behind the head. Burrows in mud or sand between tide-marks, even in brackish water. 2. Nereis pelagica, Linn. Colour red-brown or bronze. The body is widest about the middle instead of near the front. Rocky or stony ground, common. Hasborough (P.). 3. Nephthys, Sp. Body flattened ; a sickle-shaped gill under the upper lobe of each foot ; colour yellowish white, with a pearly lustre. Size, 3-4 inches. Burrows in sand. Hasborough (R. A. Todd). 4. SylHs armillaris, Orst. Length 2 inches. Colour pale yellowish- brown, with a couple of dusky marks on each segment. Feet with rather long slender dorsal cirri, divided into 8 or 10 joints. Usually common at low-water. Hasborough, rare (P.). 5. Eulalia sanguinea, Orst. Dorsal cirri of the feet flattened into broadly ovate, pointed leaves ; ventral cirri oval. Head with 5 tentacles and 2 eyes, followed by 4 pairs of tentacular cirri. Colour reddish ; length i^ inches. Off Hasborough (P.). B. Scale-Backed Worms 6. Polynoe squamata, Linn. Scales in 12 pairs, entirely covering the body, conspicuously fringed. Size i inch. Common under stones. Hasborough (P.), Cromer (Geldart), Yarmouth (Harmer). 7. Aphrodite aculeata, Linn, The ' sea-mouse.' The scales are concealed beneath a felted roof of fine hairs arising from the feet, the free hairs on the sides being brilliantly iridescent. Length 3-6 inches, exceptionally broad and thick. Burrows in mud. Hasborough : oflFshore (P.) ; on the beach (R. A. Todd). 8. Sthenelais boa, Johnston. Body long, slender, up to 8 inches. Scales covering the back, very numerous {e.g. 100 pairs). Burrows in sand. Hasborough (P.), Yarmouth (Harmer). C. Lug-worm Tribe Sluggish burrowingworms, without tentacles or prominent foot-lobes ; cylindrical in shape, indistinctly segmented. 9. Ophelia limacina (Rathke). Rather flat, slug-like ; head with a pointed snout ; gills on the middle segments only, filamentous, red. Colour pale ; cuticle pris- 82
