AEICIA CTJVIEKL 499 



Bergen, Norway (Sars, Norman); Greenland; 'Porcupine,' 1870, Station XXV, in 

 374 fathoms, and bottom temperature 53 "5°. 



Head a short pointed and very mobile cone without trace of rings or eyes. A 

 transverse line separates it ventrally from the peristomial segment, but dorsally a 

 crescent is cut from the latter at the base. It is dull salmon-yellow in colour like the 

 rest of the body, with an opaque brownish patch in the centre. 



Body (Plate LXXXVII, fig. 18) of considerable length, slightly diminished in front 

 and gradually tapering posteriorly. It is somewhat flattened on the dorsal surface and 

 rounded on the ventral surface anteriorly. The anterior region has twenty-one segments. 



Posteriorly the body diminishes to a blunt point, with the anus at the tip dorsally, 

 with two lateral flaps, a ventral process and papilla, and with two very long and very 

 slender cirri passing oif from the anterior part of it as in A. Lcdrelllil (Plate LVI, fig. la). 

 The dorsal processes (branchiae and feet) towards the tip of the tail gradually leave the 

 middle bare and pass to the sides in a diminished condition, even ceasing as distinct lateral 

 papillae before reaching the line of the vent. 



The peristomial segment is narrow dorsally, but broad ventrally, the mouth forming 

 a puckered orifice in the centre of the ventral surface towards its posterior border. Two 

 crescentic lips occur laterally, while the posterior margin of the mouth has a series of 

 symmetrical longitudinal furrows passing forward from the segments behind. 



The proboscis forms a deeply frilled organ, which projects from the mouth as a button- 

 like process. There are about ten frills in the form of a rosette. 



The first bristled segment of the body has dorsally a low papilla, from which a tuft 

 of tapering and finely camerated pale-yellow bristles emerges, and a minute cirrus is 

 present. The bristles spread over the dorsum in a fan-like manner, almost approaching 

 the middle line. The ventral division is formed dorsally of similar bristles at its upper 

 and lower edges and here and there along the row, but the main part of the row consists 

 of the broken basal regions of the bristles, which often retain the camerated marks on one 

 side and which have a distinct curve toward the tip, the convexity being on the smooth 

 edge. The tips of these fragmentary bristles, especially inferiorly, have been worn 

 apparently from use, so that they are smoothly rounded. The second foot has a longer 

 dorsal cirrus and a similar tuft of bristles in the division. The ventral row of bristles is 

 longer, and it has posteriorly a flap with several (four) papilla. The bristles have the 

 same character as in the first foot, and the area forms a file-like surface from the broken 

 ends of the bristles. The third foot is similar, though longer from above downward, and it 

 has a posterior fringe of six papillae. The same may be said of the fourth foot, only the 

 dorsal cirrus is longer. At the fifth foot a branchia appears on each side dorsally and it 

 approaches the middle line more nearly than to the dorsal cirrus. The fimbriae or papillae 

 behind the foot are also more numerous, and the four rows of bristles show signs of wear. 



The feet have the same structure (Plate LXXVI, fig. 5, which represents the tenth), 

 to the nineteenth, though the following changes are noted. From the sixth foot back- 

 ward the posterior of the three rows of ventral bristles is darker and composed of spines 

 increasing in strength so that they form a conspicuous row of brown dots. The foot also 

 becomes more free and the posterior row of papillae more conspicuous, whilst they extend 

 ventrally beyond the bristles at the seventeenth or eighteenth foot, though in others with 



