30 IVAR ARWIDSSON, SYSTEMATIC NOTES ON SOME MALDANIDS. 



somewhat more clumsy inner part; 4—5 teeth (even on the l st setigerous segment); the 

 number of uncini rather considerable (e. g. smaller spec: 3, 5, 6; larger ones: 3, 11, 13); 

 bristles are found here on all the uncini, though weak anteriorly. The other segments 

 have fully developed uncini with 5-6 teeth; the bristles are placed laterally. The 

 anterior capillary setae on the 9 th setigerous segment are verv numerous. Tubes straight, 

 of medium coarseness, consisting mainly of sand. 



I still place this species in the genus Clymenella, although there are essential diffe- 

 rences between it and Cl. torquata, the type of the genus; ef. 24 and 27. In both these 

 works (p. 206 and 25 respectively) I have also added to Johnson's characterization of 

 this species. In the latter work my view of the 4 th setigerous segment was somewhat 

 altered, compared with what I stated in 1907. In the following apart from stating the 

 number of the anal cirri in different specimens (ef. below under the notices of finds) 

 I limit myself mainly to references to figs. 24—29. 



Fig. 24 shows, among other things, the long nuchal organs and the shape of the 

 cephalic borders. Fig. 25 shows 4 distinct bands of small ocelli, two of which are straight 

 and situated on the lower side of the cephalic point; the other two curved and situated 

 outside and mainly behind the former, one on each side. In smaller specimens the ocelli 

 are considerably weaker than in larger ones. Fig. 26 shows a part of the posterior edge 

 of a strongly contracted proboscis; 1—2 »papillae» posteriorly in each row are hidden 

 beneath the arch. In a non-contracted state the proboscis looks as if slightly grooved 

 longitudinally and shows at most weak papillae (ef. 27, p. 26). Figs. 27 and 28 show 

 the strueture of the före part resp. of the hindmost part with the epidermal glands 

 stained. In the former the anterior slight collar of the 4 th setigerous segment does not 

 specially appear, yet investigation of different specimens has shown that the anterior 

 edge of this segment is somewhat different from that of other segments and that a 

 slight collar really is formed. How much defined this collar may be it is, however, 

 difficult to decide, as in an exceedingly outstretched specimen it has been practically 

 effaced. — The posterior funnel-shaped part is (on the inside) fairly short and has 

 distinct longitudinal grooves as in Clymenella minor Arwidsson (27, p. 24). 



Finally fig. 29, showing details of the right side of the 17 th setigerous segment 

 from the ventral nerve-cord to the dorsal middle line exhibits that the epidermal glands 

 here are to a great extent collected into small characteristic groups, between which 

 more solitary ones are situated in vertical lines. The same condition is found on all the 

 segments from the 10 th setigerous segment inclusive, but less strongly just on the 10 th 

 setigerous segment and the 2 posterior achaetous segments. No similar arrangement 

 of the glands in groups has, as far as I know, been observed earlier in this family. 



Notices of finds. Pleasant Beach, Seattle, Washington. Between tide-marks. 

 8 complete specimens; 26 / 7 1911 only fairly small, immature eggs, diameter: - 22 mm. 



The approximate size of the specimens and at the same time the number of the 

 anal cirri are shown by the following summary: 



