KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 63. NIO 7. 19 



7 th setigerous segment is fairly long, with .parapodia anteriorly. The 8 th is rather short, 

 with parapodia posteriorly; the anterior limit of the segment is situated on the ventral 

 side immediately in front of the large lower glandular field; on the dorsal side it runs 

 somewhat further backwards. 24 — 25 setigerous segments and 2 posterior, short and 

 not very distinct achaetous segments, which, together with the part supporting the 

 anal cone, form a short portion of the body, often rather widened posteriorly. There 

 are no anal cirri. The 6 th — 9 th setigerous segments ha ve nephridia whose orifices are 

 obviously situated behind and somewhat below the lowest uncini. The 2 nd — 7 th seti- 

 gerous segments ha ve a strong anterior band of glands. The posterior part of the 4 th — 

 6 th setigerous segments, especially the 5 th — 6 th , has fine and rather dense glands. The 

 lower, triangulär glandular field of the 8 th setigerous segment shows in its hindmost 

 part, immediately in front of the uncini, a strong glandular band, in front of which 

 there follows a weak glandular part, widest in the ventral middle line. Somewhat 

 further forward there is a small patch free from glands, with rather strong glands 

 closely surrounding it. The dorsal side of the 8 th setigerous segment has 2 narrow bands 

 of glands, which, issuing from the posterior upper corner of the lower glandular field, 

 converge anteriorly, there reaching the anterior limit of the segment; between these ob- 

 lique bands there is a large triangulär patch of glands with its posterior side, character- 

 ized by a strip of strong glands, situated between the notopodia. The l sfc setigerous 

 segment has distinct setae. The uncini of the lst_3rd setigerous segments ha ve (2—) 

 3—6 teeth, lack bristles and are few or (in smaller specimens) single in each parapodium. 

 The fully developed uncini have no projecting upper dental part; the fastening of 

 the bristles is not specially marked; up to 8—9 teeth. The anterior capillary setae on 

 the 9 fch — (about) the 14 fch setigerous segments are specially fine, numerous, with very 

 fine and diffuse borders, often with an indication of a pencil of bristles; somewhat con- 

 tracted towards the base. Tubes free, rather coarse, of sand. 



C o 1 o u r. The material bef ore me is not specially suitable for the study of the 

 reddish-brown patches on the anterior end. The most important of these are seen, 

 however, in fig. 14, which shows a weak strip along the keel of the head, a narrow patch 

 on each side of the cephalic borders, two larger patches farther back, extending to near 

 the middle line of the back, and finally a somewhat divided dorsal transverse patch, 

 över the anterior limit of the l st setigerous segment. Cf. the fig. published by Raco- 

 vitza (18, fig. 50), in which the paired patches on each side in my fig. 14 coalesce more 

 or less; hindmost of all there are a couple of welldifferentiated patches in front of the 

 anterior limit of the l st setigerous segment. Similar but scarcely separated patches 

 in front of this segmental limit were observed by me in one specimen. There are probab- 

 ly variations in these patches, which need further investigation. 



Extern al structure. In many respects this species resembles the preceding 

 one; thus, for instance, with regard to the general appearance of the anterior end. It 

 may therefore be enough to state the deviation here, all the more as the species has been 

 treated fairly completely by St. Joseph. 



The anterior end seems to be somewhat stronger than in L. johnstoni. The borders 

 of the head are, especially anteriorly, distinctly lower than in the other species. Numerous 



