KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 63. N:0 7 29 



there is at most a transverse patch just bchind the nephridia, and on the 8 th seti- 

 gerous segment there is complete absence of glands, in other words conditions agreeing 

 fairly well with those in the arctic form, according to my earlier investigations. These 

 glands seem, however, to vary rather much, even in the material from Bohuslän, 

 whence no great importance can be attached to them. 



Clymenella rubrocincta Johnson. 



(Pl. 2, figs. 24—29.) 

 1901. Clymenella rxibrocincta Johnson (21, p. 148). 



Specific diagnosis. The anterior point of the head fairly broad. The lateral 

 borders of the head not quite separated, forming between them posteriorly a deep notch, 

 which thus does not reach the cephalic plate. The nuchal organs are of medium length, 

 not reaching the lateral notches of the borders. There are ocelli, grouped in 2 straight 

 bands on the lower side of the cephalic point and in two curves behind the notches at 

 the side of the cephalic point. On the fully extended proboscis, slightly grooved longi- 

 tudinally, there are scarcely any traces of inequalities (papillae) but in a contracted con- 

 dition low papillae appear, numbering 6—7 in the posterior rows; anteriorly the papilla- 

 bearing part grows very much narrower and here there is finally only 1 papilla in each 

 row. The 4 th setigerous segment shows at the anterior edge a slight indication of a 

 collar. There are 18 setigerous segments and 2 distinct posterior achaetous segments, 

 in addition a posterior swollen ring, without any very distinct remains of parapodia. 

 The posterior cup-shaped part is strongly developed; the ventral cirrus is the longest; 

 the other cirri are alternately shorter and longer; especially in smaller specimens the 

 variation is rather regular. The anal cone is situated at the bottom of the funnel- 

 shaped posterior pit. The anal papilla is short and finger-shaped. Nephridia in the 

 7 th — 9 th setigerous segments. 1 In larger specimens the anterior part up to the 8 th seti- 

 gerous segment inclusive is on the whole glandiferous, although less so in the posterior 

 part of the segments (especially the 5 th — 7 th segments), while the part in front of the 

 parapodia is generally the most strongly glandiferous. The anterior half of the 9 th seti- 

 gerous segment is distinctly glandular all round, although decreasing posteriorly; on the 

 lower side of the posterior part of the 8 th and of the anterior part of the 9 th setigerous 

 segments there are (in large specimens) distinct bands of glands along the ventral nerve- 

 cord; on the lätt er segment these bands reach somewhat behind the middle of the seg- 

 ment in their hinder part more and more leaving the nerve-cord free. Further back 

 similar weak bands begin to appear along the whole segments, combined more and 

 more with glands under the parapodia. Quite ventrally on the posterior cup-shaped 

 part there is a longitudinal, fine, fairly marked strip of glands, surrounded most clo- 

 sely by zones poor in glands. The uncini on the l st — 3 rd setigerous segments are on 

 the whole fairly similar to the developed uncini, but with a shorter outer part and a 



1 Above the hindmost nephridia there is on each side an extended gonad. 



