KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 63. NIO 7 9 



measurements in fig. 4 (2) show, however, that with this interpretation the individual 

 reproduced could not ha ve had 24—25 setigerous segments; there can therefore be no 

 question of its being L. leiopygos Grube, unless we assume that the figure is constructed 

 from different parts, the anterior of which perhaps had the posterior part only very 

 feebly regenerated af ter previous mutilation. The identification with L. johnstoni 

 — and it must be one of these two species — is supported by the absence of brown upper 

 anterior spöts and the probability that the individual shown in fig. 4 (2) may have had 

 at least 17—18 setigerous segments; in other words that 2—1 setigerous segments and 4 

 achaetous segments may have been present between the last normal setigerous segment 

 and the ring at the base of the anal cone; this does not seem specially probable because 

 of the great development of the anal cone, which, in addition, to judge from early re- 

 generative stages of L. johnstoni, ought to have had 3 anal cirri developed. Here, too, 

 we may of course presuppose that the figure was ebtained from different parts. The 

 final conclusion will be, however, that it is still impossible to state with certainty, which 

 species ought to be identified with L. ebiensis. 



The name of L. leiopygos for the species with 24—25 setigerous segments is adopted 

 here, as, in my opinion there is no doubt about its identity with Clymene leiopygos Grube 

 1860 (3, p. 91). Grube states that his single individual (only 2.6 cm. in length) was 

 broken in two parts : the anterior part comprising 9, the posterior part 16 setigerous 

 segments; between them an intermediate part was probably missing. If we assume 

 that this part comprised 1—2 segments, we reach a total of 24 — 25 setigerous segments, 

 which is characteristic of the specimens investigated by me (ef. further St. Joseph be- 

 low). Grube's statement that the parapodia of the 8 th setigerous segment, like those 

 of the lst_7th setigerous segments, are situated in front of the middle of the segment, 

 must surely be due to this segment having been strongly contracted, for the parapodia 

 of the 8 th setigerous segment have ne ver, as far as is known, such a position in this species. 

 It is of special importance to point out that the posterior end figured by Grube (fig. 3 a), 

 which apparently lacks posterior achaetous segments, closely agrees with my fig. 19. 

 Låter Grube (8, p. 56) expressed doubt whether the tow ends of his type-specimen 

 really belonged to each other, and I was myself earlier (24, p. 145) inclined to agree with 

 him in this. Grube also found the presence of setae on the last segment especially note- 

 worthy, which with our present knowledge of the species does not give us any trouble. 



The L. clypeata described by St. Joseph 1894 (16, p. 139) is said to have 25, some- 

 times 29 setigerous segments, but no detailed statement is given as to the occurrence 

 of 29 setigerous segments. If, like Elwes (26, p. 74) af ter him, he had stated 25— 29 seti- 

 gerous segments or like Mc Intosh (31, p. 313; ef. below) 24—29 setigerous segments, 

 it would have been, of course, a different matter now; the statement as to 29 setigerous 

 segments must with good reason be taken most cautiously. Other wise St. Joseph' s 

 description agrees in all essentials with the one given by me below of L. leiopygos; we 

 have dealt beyond doubt with the same species. St. Joseph remarks that the anal 

 segment follows immediately af ter the last setigerous segment (ef. above). St. Joseph 

 also points out the close agreement with Leiochone leiopygos with regard to the strueture 

 of the posterior end, but considers this species to be rather uncertain, on account of 



K. Sv. Vet. Akad. Handl. Band 63. N:o 7. 2 



