KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 63. N:0 7. 35 



ments have a lower median patch of glands, weakest on the hindmost segment. Round 

 the swollen posterior ring (f ig. 35 ) there is a weak band of glands. The cup-shaped part 

 is slightly glandular, both outside and inside; the points of the cirri are decidedly gland- 

 ular. The ventral nerve-cord is free from glands on the outside of the cup. 



Setae. In larger specimens there are on the l st — 3 rd setigerous segments in each 

 parapodium some rather strongly changed uncini (text-fig. 15). The single tooth is 

 somewhat curved and, at least on the 2 nd and 3 rd setigerous segments, pointed; on 

 the l st setigerous segment the uncinus is somewhat weaker than on the others and as 

 a matter of fact often blunt at the point. In younger specimens the uncini are more 

 like ordinary, weakly developed ones; they number, for instance, 1, 2, 2; teeth: 2( — 3) 1 , 

 3— 4 2-3 . Weak bristles were observed on the 3 rd and exceedingly weak ones on the 2 nd 

 setigerous segment. Further in one specimen with 1, 3 and 2 uncini the uncinus of the 

 l st setigerous segment has one tooth, which is but little curved; otherwise the uncinus 

 is slightly changed. On the 2 nd setigerous segment the 3 rd uncinus is somewhat stronger 

 than the others, with the large tooth less curved than in the two others, i. e. the lowest, 

 youngest uncinus shows, as is natural, a somewhat greater correspondence with the 

 definitive spine-like uncini than the other two show. 



Other setigerous segments have fully developed uncini (text-fig. 16), the bristles 

 of which are beneath the large tooth; there are 5 bristles on the 4 th — 6 th setigerous seg- 

 ments, decreasing gradually to 4 posteriorly. The number of teeth (in a specimen 

 of average size) are 5 4 , 5— 6 5 , 6 6-8 , 6— 7 9-10 , 7 U ~ 13 and 7— 8 14-20 . , The number of uncini 

 on the 4 th — 14 th setigerous segments of the same specimen are 12, 16, 15, 17, 20, 19, 

 18, 20, 20, 21 and 20. 



The anterior capillary setae, with rather long points, have narrow borders, equally 

 large on the whole, on the l st and 2 ndi setigerous segments, but most distinct on the 2 nd 

 setigerous segment. On the 3 rd — 5 th setigerous segments first the one and then the other 

 börder decreases, so that from the 6 th setigerous segment scarcely any and from the 8 th 

 setigerous segment no borders at all can be detected. The points of the anterior capillary 

 setae are smooth on the anterior 3—4 setigerous segments, but from the 5 th setigerous 

 segment inclusive there is a fine plume-like »pencil» at the point; from the ll th seti- 

 gerous segment this pencil is distinct. On the 8 th — 10 th , especially the 8 th — 9 th setigerous 

 segments, these anterior capillary setae are very numerous and fine and provided with 

 a fine pencil. 



As is often the case, the posterior capillary setae have considerable borders only 

 on the lst_2nd ( — 3rd) s especially the 2 nd , setigerous segments, where borders of almost 

 equal size are developed. Posteriorly the borders are narrow and decrease in addition 

 somewhat in width, generally about equally. On the 8 th — 10 th setigerous segments 

 the number of posterior capillary setae is not increased. The base of the points is some- 

 what expanded and light from the 12 th or 13 th setigerous segment inclusive. 



Size. The one complete specimen from Salcombe measures 141 mm. in length 

 with a maximum width of 2*5 mm.; the specimen is one of the largest in the collection. 



Tubes. There are only traces of tubes in the material; the tubes consist of fine 

 sand and are certainly free. 



