366 ANTINOE SAKSL 



It extends to various parts of the Arctic Sea, to the Gulf of St. Lawrence (where it 

 is common), and to the shores of America (Yerrill). 



Head (Plate XXVIII, fig. 10) about as long as broad, with two acute peaks in front. 

 The two posterior eyes are much nearer each other and smaller than the anterior pair — 

 which are situated within the dorsal margin of the widest part of the head, and therefore 

 considerably removed from the anterior peaks. These eyes in the Canadian forms are 

 further forward, more lateral in position, and present in some a lens-like central thickening, 

 and both they and the posterior pair are larger than in the European forms, which have 

 eyes of moderate size. The median tentacle is brownish, with a slight swelling below 

 the very long filiform tip. It has numerous long clavate cilia. The lateral tentacles are 

 small and subulate with a tapering tip, and have short clavate cilia, The palpi are long 

 and tapering, furnished with minute and somewhat clavate papilla, which often have 

 processes at the tip. A few of the papillae occur on the tapering extremity. The 

 tentacular cirri have very long slender tips and numerous clavate cilia of moderate length, 

 a few shorter forms occurring on the filiform region distally. These organs are boldly 

 areolar, and, like the tentacle, are tinted brownish. 



Body. — Somewhat broad, tapered a little in front, and more distinctly so posteriorly; 

 bristled segments thirty-eight. The colour is brownish dorsally, generally arranged in 

 belts across the segments, which posteriorly show a broader belt in the middle and a 

 narrow one in front and behind. The Canadian preparations are darker, the tubercle on 

 the cirrigerous segments being dark olive, so that the tints are striking. As usual, the 

 pigment is broken up in the terminal segments, and a pale band occupies the median 

 line. The under surface is pale. The segmental elevations are well marked and project 

 posteriorly as distinct processes, while the papilla are directed nearly straight backward 

 instead of between the feet. A marked feature ventrally is the prominence of the 

 spinigerous lobe of the ventral division of the foot. 



Proboscis. — The extended proboscis has nine conical papillae dorsally and ventrally. 



Scales (Plate XXXIII, fig. 17). — All the Norwegian examples show that the ovoid 

 or rounded scales have their surface covered with small conical spines ; indeed, in the 

 Arctic examples these are visible under a lens. The spines in the posterior scales (those 

 alone present) attain larger dimensions externally and anteriorly, and three or four larger 

 conical processes are found on the posterior border. Cilia, of considerable length in the 

 latter case, occur on the outer and posterior borders and invade the neighbouring surface. 

 They are slender and translucent, with clavate tips. 



On the other hand, the scales of the Canadian examples were more or less smooth, 

 soft, somewhat reniform, and furnished with cilia of moderate length on the outer and 

 posterior borders and on the neighbouring surface. The opacity of the scale, however, 

 may hide the spines if they are few. At any rate, in the specimen from Barent's Sea 

 numerous conical papillae were present. Unfortunately many have no scales, and at best 

 they are few in the preparations. 



Feet. — The first foot bears a strong spine and about three bristles of the dorsal type, 

 very slightly curved, and with boldly marked spinous rows. The spine forms a powerful 

 projecting process in large specimens. 



The second foot is also marked by the great prominence of the dorsal spine, and has 

 a series of somewhat strong slightly curved bristles with well-marked spinous rows, which 



