A HISTORY OF NORFOLK 



2. Sagartia hell'ts (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 different 

 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 occurs. 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 crassicornis (O. F. Muller). 

 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. CHiETOPODA 



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 divenicolor, 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. Syllis armillarisy 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 li 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 : offshore (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 burrowing worms, 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- 



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