PABAMPHINOME PULOHBLLA. 223 



In 1872 G. 0. Sars gave an excellent description with figures of this form under the 

 name of Paramphinome pulchella, M. Sars, mentioning that it is widely distributed 

 round the Norwegian shores. As he had an opportunity of observing living specimens 

 his description has been, as far as possible, added to the original account. 



The head is rounded oval, convex dorsally, somewhat conical in front and even 

 more so behind, since it projects over the first segment almost to its posterior border. 

 It is furnished with five tentacles — two shorter in front and two longer on the projecting 

 median region. The unpaired is behind the latter on the tongue-shaped posterior part 

 of the head. No eyes are present. 



The body is nearly cylindrical, a little wider than high, and tapering at both ends. 

 The bristle-bearing segments range from twenty-three to thirty-three, are about twice as 

 wide as long, and distinctly divided from each other. Each has a dorsal and a ventral 

 division of the foot, and a dorsal and a ventral cirrus, the latter organs being short — 

 except in the first and three last segments. The mouth has four fleshy lobes or lips, 

 and the proboscis is often everted in spirit-preparations. The anus is terminal and 

 crescentic. 



The branchiae are confined to the anterior part of the body, and appear to be 

 normally five pairs, six pairs being less common, while four occur in younger specimens. 

 They increase in size from before backwards, the first being on the fourth bristled 

 segment. They are dichotomously divided, broad, fan-shaped organs, which even over- 

 lap on the dorsum. They have two primary divisions, each of which is more or less 

 subdivided. Two lateral vessels are visible winding along the body and connected by 

 branches with the gills, besides a median ventral vessel which anastomoses with the 

 former. 



The dorsal and ventral divisions of the foot are widely separated. The bristles 

 of the superior lobe (Plate XXXV, figs. 19 b, c) are for the most part shorter and 

 stouter than the inferior, the former (b) being one of the largest, viewed somewhat 

 obliquely so as to show the faint serrations. When the bristle is turned round (as in c) 9 

 the latter are scarcely observable. Besides, there are some long, slender, and tapering 

 bristles faintly and sparsely serrated towards the tip. The inferior lobe of the foot has 

 likewise two kinds of bristles, a few (Plate XXXV, fig. 19 a) with the tip of the shaft 

 dilated and bifurcate, one of the distal portions being short and simple, the other 

 elongated and serrate. The rest of bristles in this lobe are either long slender forms 

 with fine serrations towards the tip, or short and more boldly serrate. 



In the first body-segment, in front of the insertion of the dorsal bristles, are on eac 

 side two strong and somewhat S-shaped hooks. A 



The want of eyes, and of a distinctly marked caruncle, as Sars says, distinguishes it 

 from other known representatives of the family. The form of the bristles resembles 

 that of other members of the group, but the remarkable hooks on the dorsum of the 

 first segment are unique. 



Colour. — Pale and rather transparent, so that the dark intestine is readily visible. 



The animal is somewhat sluggish, rolling itself up in a circle when irritated, so as to 

 make the long bristles project outward like those of a Nerine-l&rva,. When unmolested 

 it uncoils and moves hither and thither with a sluggish snake-like motion. 



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