KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 63. N:0 7. 27 



the ventral side. On the 2 last-mentioned posterior ends the following cirri — beginning 

 with the ventral cirrus no. 1 and then counting clockwise — are very short: nos. 6, 9, 

 10, 12 and 15; 2, 9, 13, 15 and 21. 



The 10 th setigerous segment (and no others) has, as in the main species, numerous 

 capillary setae, the posterior ones of which are fine and provided with a pencil of bristles. 

 Yet these setae are, as in the Mediterranean specimen mentio ned below, not quite as 

 numerous as in the main species. For the uncini see below. 



The anterior part, up to and including the 13 th setigerous segment, of the largest 

 specimen measures 25 X 1*5 mm. — 1 specimen has the anterior part regenerated up 

 to the 8 th setigerous segment inclusive and 1 specimen from the 9 th inclusive. 



Trieste, Nov. 1902. From this locality the Riksmuseum in Stockholm has several 

 specimens, among them 4 complete ones, all with 18 setigerous segments. As earlier 

 mentioned (24, p. 191), the largest specimen measures 76 mm. in length and scarcely 

 2 in width. The proboscis papillae are possibly somewhat slightly more numerous than 

 in the main species, as in an investigated specimen 5—6 were observed anteriorly in 

 the row and 10—11 posteriorly. Still such statements are always rather vague, and 

 moreover there may be individual variations. 



These Mediterranean specimens, expecially the larger ones, ha ve rather numerous 

 ocelli, among which there is a fairly connected middle group straight in front of the 

 mouth (ef. text-fig. 10). Fig. 20 shows the cephalic plate with glands (ef. Nolte's asym- 

 metric fig. 32) and fig. 21 the posterior end with its 4 achaetous segments and its long 

 ventral cirrus. 



One anterior end, which up to the 14 th setigerous segment inclusive attains a length 

 of 40 mm., compared with a maximum width of 2 mm., has the following numbers of 

 uncini: 1—2, 2, 2, 11, 12, 10, 12, 13, 15, 15, 15, 16, 17, 17. 



The uncini on the l st — 3 rd setigerous segments — without bristles as in the main 

 species — are more or less strongly open, with the l st tooth long and pointed, especi- 

 ally on the 2 nd — 3 rd setigerous segments; ef. text-fig. 11. The teeth on these uncini: 

 2-3 1 , 3-4 2 " 3 . 



A specimen from the Clyde has similar uncini at least on the 3 rd setigerous seg- 

 ment; ef. text-fig. 12. On the l st setigerous segment they are less open (text-fig. 13) 

 and on the 2 nd setigerous segment they may resemble Nolte's fig. 12, which shows a 

 comparatively short first tooth, but they seem as a rule to have an equally long and 

 pointed l st tooth as the uncini of the 3 rd setigerous segment, although less projecting. 

 There are 3—4 teeth throughout. — The uncini of the following segments are every- 

 where like those of the main species. 



The largest egg observed in an immature female measured 0*18 X 0'21 mm. — 

 1 specimen had the anterior part regenerated up to the l st setigerous segment inclusive, 

 another, the posterior part from the 14 th setigerous segment inclusive. 



With regard to the epidermal glands I found, unlike Nolte, the anterior band 

 of glands nowhere weaker on the 2 nd than on the l st setigerous segment. On the other 

 hand, like Nolte, I found, especially on specimens from the Clyde and also on those 

 having the anterior glandular band of the l st setigerous segment weak, a small, more 



