244 TEREBELLIDiE. 



Sabella granulata, Mont. Test. Brit. 544. Stew. Elem. ii. 423. Turt. 



Brit. Faun. 202. Penn. Brit. Zool. iv. 369. edit. 1812. 

 Nereis pectinata, Turt. Brit. Faun. 134. 

 Amphitrite auricoma, Cuv. Regn. Anim. iii. 195. Griffith's Cuv. xiii. 



14. Penn. Brit. Zool. edit. 1812, iv. 91. Stew. Elem. i. 389. pi. 12. 



f. 1, 2. Rathke in Ray Soc. Rep. 1845, 283. H^illiams in Ann. Sf 



Mag. Nat. Hist. ser. 2. xii. 396. 

 Pectinaria belgica, Lam. Anim. s. Vert. v. 350 ; 2de edit. v. 602. Tem- 



pleton in Loud. Mag. Nat. Hist. ix. 234. Landsborough, Excurs. 



Arran, 50. Gruhe, Fam. Annel. 82. 

 Cistena Pallasii, Leach in Suppl. Encyclop. Brit. i. 452. pi. 26. 

 Amphictene auricoma, Savigny, Syst. Annel. 89. 



Hab. Sandy shores within the lowest tide-mark. 



Desc. Worm cylindrical, rather more convex on the dorsal than 

 on the ventral surface, tapering insensibly backwards, and terminated 

 by the abdomen in the shape of a semiovate appendage or disk sepa- 

 rated from the body by a deep stricture ; the body invested with a 

 smooth thin serous skin reflecting a blue and green iridescence, and 

 annulose, with the lines of separation most distinct on the ventral 

 side. There is no head properly so called, but the first four seg- 

 ments constitute a cephalic portion. The spines which guard the 

 front are in two fan-shaped fascicles, and form a stockade or comb 

 of strong bristles in a single line, the central bristles of each comb 

 being the longest, whence they lessen towards both sides ; there are 

 about sixteen bristles in each fascicle, which are setaceous, smooth, 

 curved, and weak at the points, so as to resemble a waggoner's whip, 

 and of a golden bronzed colour. The tentacles which garnish the 

 ventral margin of the front, and overlook the mouth, are filiform, 

 and capable of being extended and contorted ; but the cirri on the 

 sides are setaceous, and longer than those on the second segment. 

 The branchiae occupy the sides of the third and fourth segments, 

 where they are rendered conspicuous by their bright vermilion 

 colour ; they are short, and consist of numerous lamellse in a uni- 

 lateral imbricated closely -set series ; the anterior pair larger than the 

 posterior, with somewhat triangular lamellae, while those of the pos- 

 terior pair are elliptical. There are sixteen pairs of feet, a pair to 

 each ring of the thorax : the anterior pairs are smaller, and more 

 wide apart than the posterior, which become crowded. Each foot 

 has a protuberant ramus armed with a fascicle of dark burnished 

 bristles, which vary in number, there being only a few (about four 

 or five) in the anterior pairs, about nine in the middle pairs, and 

 again about five in the posterior pairs. The bristles are all simple 

 and smooth, those of the front and middle feet setaceous, some 

 straight, and some bent about the middle; those of the posterior 

 feet stouter and shorter, and curved at the point. To every foot 

 there is a ventral or inferior linear-elliptical lobe, constructed with a 

 long series of minute denticles forming a straight line. The caudal 

 portion has no feet nor bristles, but is obscurely annular, the furrows 

 being convex and a little divided ; or, as Sir J. G. Dalyell describes it, 

 it is a " large scoop exhibiting rudimental segments indenting the 

 back." Tube cylindrical, tapering insensibly and very slightly back- 



