38 IVAR ARWIDSSON, SYSTEMATIC NOTES ON SOME MALDANIDS. 



b) Stout, fairly few and otherwise typical ocelli, size 65 X 0"8 mm. Only one straight pos- 

 terior limit between the 7 th and 8*h setigerous segments. The posterior end normal. Tube of 

 quartz granules, walls 02 mm. thick. 



c) Segment limit = that of b). Ocelli present. 



d) Two limits, the anterior one distinct, the posterior one weaker, are present between 7 th 

 and 8 th setigerous segments; no ocelli. 



Salstone. Mar. Biol. Ass. 3 spec., a— c, all complete with 19 setigerous segments; 

 no ocelli. 



a) Only a posterior somewhat winding limit between 7 th and 8 th setigerous segments. The 

 posterior end fairly normal, but the upper right long cirrus is somewhat shorter than the rest and 

 also more or less fused with the adjacent short ones; in addition the ventral cirrus is rather 

 short and wide. 



b) This specimen has two straight limits between the 7 th and the 8 th setigerous segments 

 (fig. 39). Of more or less long anal cirri there are here too in a way 3 on each side; the ventral 

 cirrus is lacking and the long lower cirrus on each side has moved clown to the ventral middle 

 line, with its base touching that of the neighbouring cirrus. If we designate the vanished ventral 

 cirrus as no. 1, the more or less long cirri are nos. 2, 4, 6, 15, 16, 17. No. 6 is rather short and 

 wide; the length of the others increases gradually in the following series: 4, 2 (17), 16, 15; they 

 are all more or less wide and irregular; ef. fig. 40. Cirri 7 — 14, of which 7, 8, 13 and 14 are very 

 short, are not lobate at the point. In addition there are 1 — 2 similar cirri under the uppermost 

 »long» cirrus on the left side and another similar one in the following space, but no others. Of 

 these 10 — 11 short cirri only 1 — 2 of the lateral ones are, however, lobate at the point. This 

 specimen is thus rather irregular with regard to the posterior end. 



c ) Only an anterior limit between the 7 th and the 8 th setigerous segments and even this has 

 disappeared on the greater part of the dorsal side. On the lower side of the well extended part 

 there is a distinct break in the glandular band along the ventral nerve-cord at this limit. The 

 glandular band of the 8 th setigerous segment forms on the ventral side a projecting part, closely 

 resembling the corresponding one in the genus Leiochone. The anal cirri are exceedingly irregular; 

 the longer ones, including the ventral cirrus, consist of nos. 1, 2, 4, 5, 7, 9, 11, 12. The last short 

 cirrus is no. 13; this and no. 10 are not lobate at the point. The ventral cirrus is short, wide 

 and bilobate, with the left point shortest. The long cirri nos. 5, 7, 9, and 12 are of the usual 

 form; no. 11 is certainly long but wider towards the base than normally and showing signs of being 

 composed of two cirri. Cirrus no. 2 is short and wide; no. 4 still wider and only slightly longer 

 and also with a notch on the side of the point. If the right point of the bifurcated ventral cirrus 

 is taken as the beginning of a long cirrus (no. 14), we get 4 pairs of longer cirri and also an 

 entirely symmetrical arrangement of the cirri. 



Of these 3 specimens a medium-sized one has fine anterior capillary setae only on the 8 th and 

 9 th setigerous segments; the former segment has also some ordinary, coarser anterior capillary setae. 

 One large specimen has similar fine setae on the 8*h and 9 th setigerous segments and also some on 

 the 7 th setigerous segment. 



Salstone. Mar. Biol. Ass. n / 9 1900. 7 specimens, a— g. 



a) 19 setigerous segments; size 207 X 1'5 mm.; large, distinct, relatively few ocelli, but none 

 in the middle line. No limit between the 7 th and 8 th setigerous segments. The lateral glandular 

 bands between the capillary setae on the 8 th and 9 th setigerous segments are considerably stronger 

 than those between the 7 th and 8 th . The glandular band on the 8 th setigerous segment has a smaller 

 pointed anterior swelling medially on the lower side; on the upper side there are 3 such swellings. 

 A noticeably wide part, slightly curved at two places (one curve in the middle line of the ventral 

 side, the other to the right, here more or less bounding off the smallest portion of this part) oc- 

 cupies the place of the ventral cirrus, etc. If this part is taken as no. 1, the long cirri are nos. 



