KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 63. N:0 7. 39 



2, 4, 6, 12, 14, 15; nos. 17 and 18 are the last two short cirri and are moreover j oined at the 

 base. Only a few single ones of the short cirri are lobate at the point. 



b) Posterior end; 3 pairs of long anal cirri and in addition single half-long ones; the short 

 cirri typical, i. e. lobate at the point. 



c — e) Posterior ends, very irregular, two at least with a number of short cirri lobate at 

 the points. 



f) posterior end, more or less decidedly irregular; short and long cirri alternate regularly 

 here and there. Just behind the parapodia of the hindmost normal setigerous segment (18 th ?) 

 there is on the left side a setigerous parapodium, but only weak remains of the corresponding right 

 one; the posterior end itself is in this way twisted to the right, but is normal as far as the achaet- 

 ous segments are concerned. It is possible that this specimen had been previously torn off 

 obliquely at the parapodia of the hindmost setigerous segment. 



g) Posterior end very much altered; broad parts, rather thick at the edge, replace most of 

 the anal cirri, of which a number of narrow and short ones are, however, found here and there. 



A brief summary of this survey gives the following results. Scarcely any specimen 

 agrees entirely with the original description. Thus on several specimens ocelli are not 

 observed; whether this is connected with the state of preservation or is to be regarded 

 as indicating a disappearance in older specimens, is still uncertain. With regard to the 

 limits between the 7 th and 8 th setigerous segments a number of specimens have none 

 at all, some have one situated far forward (as in the original description), others, on 

 the contrary, only one farther posteriorly, which is often, however, irregular or in- 

 complete. Finally 2 specimens have both limits developed, the posterior one being, 

 however, in one case weaker than the anterior one. Without an anatomical investiga- 

 tion the question as to which limit is to be considered as corresponding to the other 

 segmental limits is always more or less uncertain; as has been already mentioned, how- 

 ever, two specimens have the glandular band along the ventral nerve-cord broken off 

 at the anterior limit in the same way as, e. g., the limit between the 8 th and 9 th se- 

 tigerous segments. The glandular band of the 8 th setigerous segment is often irregular 

 at its anterior edge, especialty on the lower side; no variation of this sort has evi- 

 dently been found so far in the whole Maldanid group. One specimen has only 18 se- 

 tigerous segments, without the number of posterior achaetous segments being at the 

 same time increased. The anal cirri are certainly quite normal in 4 spec. and almost 

 or fairly normal in 7 (in 2 spec, for instance, there was 1 pair of smaller long cirri be- 

 sides the normally occurring 3 pairs), but in the other 9 spec. the posterior end is more 

 and in most cases exceedingly irregular; all these latter specimens are from Salstone, 

 from where as a matter of fact, there is no normal posterior end. Whether these ab- 

 normalities have arisen from external injuries (e. g. bites of Crustaceans etc.) or are 

 of another nature, is uncertain. It is certain, however, that even with regard to the 

 posterior end the species in question shows considerably greater irregularity than is 

 usual in this group. Finally 8 specimens were investigated with regard to the anterior, 

 specially fine and numerous capillary setae which, according to my earlier description 

 (28, p. 222) replace the ordinary anterior capillary setae on the 8 th — 9 th setigerous seg- 

 ments. 3 of the specimens had in addition a few ordinary anterior capillary setae on the 

 8 th setigerous segment. A medium-sized specimen had a number of fine setae and 



