KUNGT-. SV. VET. AKADEMIENS HANDLINGAR. BAND 59. NIO 4. 25 



nation and from this and to the 15 th segment the P is rather pronouncedly 2—3- 

 edo-ed. The 16 th — 20 th segment more rounded with thickened, spiny borders distally. 

 P 3 18, 8—10 mm. The two first segments without out-turned prominences, remaining 

 segments with large and verv spiny processes, which at the last 8 ioints round the 

 distal parts of the segments form a spiny garland. This garland also appcars but 

 still more delicately developed up to P 10 . P 4 16—18, 11 — 12 mm; P 5 12, 7 — 9 mm; 

 P n 15, 7 mm. — P a rather short, corresponds to P^ P b the longest, P, a little shorter. 



Disk without lime-plates. 



Colour in life minium red, in spirit a little fainter. 



In 1882 P. H. Carpenter distingnished Anledon crenulata from A. variipinna, 

 the former having crenulated R:s and the distal parts of the arms smooth. In the Chal- 

 lenger Report he has communicated a long critical investigation as to the variability 

 of the species variipinna and he comes to the conclusion that the »species» crenulata, 

 dubia (Carp.) and decipiens, irregularis (Bell) ought all to be referred to one and 

 the same species. He has demonstrated in a very plain manner how the distinguishing 

 characters are distributed on different forms and how they vary and transgrediate 

 into one another. A. H. Clark has also found a wide variability in his Äustralian 

 specimens (ef. for instance op. 32, p. 764 ff). In 1914 A. Reiciiensperger also 

 made an excellent contribution to the variability of this »proteus» -species, to quote 

 Carpenter. In order to elucidate how wide the variability really is I give some 

 figures : according to Carpenter the number of the arms varies between 1 1 and 25, 

 C XV— XXX, 20—35. According to Reichensperger the figures are: arms 10—20, 

 C:i XV— XXIV, 35-38, and according to Clark (op. cit, 32): arms 14—26; C:i 

 XVT-XXIX, 35—45. 



From all these facts mentioned above it seems to be clear that it is rather a 

 hazardous matter to re-propose crenulata without further investigation, as Clark has 

 clone in his op. cit. 33. In the cit. op. 43, 1915, he does not mention variipinna 

 as an Äustralian species, so that the specimens described in op. cit. 32 ought obviously 

 also to be referred to crenulata. 



Two of my specimens agree with crenulata inasmuch as the R.s are granu- 

 lated — the third specimen has the R:s almost completely concealed (on account of 

 which it is rather difficult to see if they are smooth or granulated) — with variipinna 

 in the strongly produced prominences at the distal arm-joints. The exceptionally 

 high number of cirri and arms are added as new » characters-). The dorsal spiny 

 processes on the cirrals are rather insignificant and I have found that here, like 

 everywhere else, these formations occur rather capriciously (influenced by the age of 

 the C:i etc), in the case under discussion they sometimes begin on the 12 th , some- 

 times first on the 24 th segment. 



Considering that Carpenter has shown how differently the processes of the 

 arms might be developed in various specimens of this species, I find it rather prob- 

 able that the crenulation of the R:s is also subject to a considerable variability. 

 And if this is the case, I think it would be more advisable once more to let crenu- 

 lata be absorbed in variipinna, particularlv as my specimens have only one of the 



K. Sv. Yrt.. AJjad. Handl. Band ."»9. N:o i. 4 



