KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 63- NIO 7. 



33 



that shown in fig. 30 is sometimes seen. The nuchal organs are long, reaching almost 

 to the lateral notches of the borders; ef. fig. 30. Ocelli, text-fig. 14, are found on the 

 lower side of the point of the head and especially on the side parts under the fore- 

 most part of the borders. The proboscis has low papillae in about 24 rows; in each 

 row 6—7 papillae posteriorly and 2 opposite the cephalic point. 



The anterior edge of the l st setigerous segment is only slightly bent anteriorly 

 at the sides. The 7 th setigerous segment is short and at the same time the 8 th is long; 

 in other words the limit between them seems to correspond to the limit or groove de- 

 scribed in Eucl. droebachiensis, which is situated there at about the middle of the 7 th 

 setigerous segment. The following segments — especially the ll th — 17 th — are long; 

 there then follow 3 setigerous segments decreasing in length, in other words the 

 whole number of setigerous segments observed in the 2 complete specimens present 

 (Salcombe) is 20. 



The number of the following achaetous segments is generally 3, observed, inter 

 alia, on numerous loose posterior ends. Both the complete individuals form, how- 



Text-fig. 14. Euclymene modesta. — 



Schematic fignre of the left side of 



the head, seen obliquely from below. 



Ocelli. 30: 1. 



Text-fig. 15. Euclymene modesta. — Text-fig. 10. Euclymene modesta. — 

 Spine from the left side of the 3 rd Uncinus (first from above) from the 

 setigerous segment. 200: 1. right side of the 13 th setigerous seg- 



ment. 300: 1. 



ever, an exception in this respect: thus one has capillary setae on the left side of the 

 foremost of its otherwise achaetous segments (a loose posterior end shows the same 

 conditions), and the other (fig. 34), whose posterior part seems not to have been 

 regenerated to full size (from the 19 th setigerous segment inclusive), shows onty 2 

 achaetous segments. At any råte no 3 rd segment of this sort could be established here 

 with any certainty. 



In normal specimens the foremost of these posterior achaetous segments exhibits 

 remains of stout parapodia (fig. 35); on the next segment the same remains are con- 

 siderably smaller, and on the hindmost segment they cannot be traced except at most 

 by accumulations of glands. There then follows a somewhat widened, ring-shaped part, 

 passing into the posterior, cup-shaped part, which carries at its edge, besides the some- 

 what longer ventral cirrus, short cirri of equal length. These anal cirri have been ob- 

 served to a number of 22—31 (ef. explanation of fig. 34). Several specimens with 22 

 —24 anal cirri have one or more of them bifurcated at the top or one or two pairs of 

 not quite separated cirri. Specimens with 28—31 cirri do not show such conditions, 

 so that it is presumable, especially as the latter specimens are among the larger ones, 

 that the number of the cirri increases during growth. 



The anal cone at the bottom of the cup-shaped part is low, with a distinct part 

 of the ventral nerve-cord. The anal papilla appears in several cases to be bifurcated, 



K. Bv. Vet. Akad. Handl. Band 63. N:o 7. 5 



