30 IVAR ARWIDSSON, SYSTEMATIC NOTES ON SOME MALDANIDS. 



Notices of finds. S. Devonshire: Salcombe, rauddy beach in front of Marine 

 Hotel, 5 specimens 1 , 4 of which are from Mar. Biol. Ass. n / 8 1900 and 1 collected by 

 Potts, Sept. 1908; Salstone, 6 specimens 1 , Mar. Biol. Ass. n / 9 1900. — Firth of Clyde: 

 Millport, 3 specimens 1 , June 1910. 



Regeneration. Anterior end: 1 specimen up to the 8 th and 1 up to the 9 th 

 setigerous segment; posterior end: 1 specimen from the 19 th setigerous segment. 



Parasites. On two posterior ends and on one middle piece (posterior seti- 

 gerous segments) there are numerous specimens of Loxosoma sp. 



Caesicirrus neglectus Arwidsson. 



(Pl. 2, figs. 36—40.) 

 1911. Caesicirrus neglectus Arwidsson (28, p. 217). 

 Syn. ? Euclymene digitala (Grube). 

 ? Clymene oerstedii Claparéde. 

 IClymene claparedei Orlandi. 

 For these uncertain synonyms see pp. 40 ff. 



Tlns species is present in a number of specimens, many of which, however, show 

 distinct deviations from the typical conditions. A number of specimens show only the 

 typical limit, situated far forward, between the 7 th and 8 th setigerous segments, others 

 also or merely a limit situated in front ot the glandular band of the latter segment 

 (compare the comparatively detailed examination of this material below and also the 

 summary that follows it). In the account of the anal cirri the ventral cirrus is every- 

 where put = 1 and the other cirri are counted clockwise, starting from 1. The ma- 

 terial comprises the following specimens. 



Firth of Clyde: Millport, June 1910, 3 specimens, a— c. No ocelli observed. 



a) 19 setigerous segments; the posterior part regenerated from the 15 th setigerous segment. 

 Size up to the 14* h setigerous segment 70 X 1"3 mm. No distinct limit between the 7 th and 8 th seti- 

 gerous segments, but there seems to be a sort of attempt at a posterior limit. The dorsal glands on 

 the 8 th setigerous segment are typical, the ventral glands of the same segment are, as in several other 

 cases, divergent (see fig. 36). In other respects the glands seem normal except that the narrow 

 longitudinal lateral bands on the 8 th — 12 fch setigerous segments are not visible. The posterior, re- 

 generated part is certainly not longer than 3'5 mm., but has, however, besides the ventral cirrus 

 and short cirri, 3 pairs of longer cirri and in addition 1 pair of half-long cirri, nos. 3 and 25. The 

 long cirri are nos. 5, 8, 11, 16, 19 and 22, a total of 26 cirri. 



b) Anterior end; the lower glands of the 8 th setigerous segment are shown in fig. 37, and fig. 38 

 shows the foremost part of the glandular band from above; in front of this glandular band is seen a 

 sort of more or less winding segmental limit. No anterior limit between the 7 th and 8 tn setigerous 

 segments can be observed. 



c) 19 setigerous segments; the anterior end regenerated up to the 3 rd setigerous segment and 

 the posterior end from the 17 th setigerous segment. A winding linvit about as in the preceding 

 specimen; on the ventral side, however, the glandular band has a medially placed curve anteriorly. 

 Between the parapodia of the 7 th and 8 th setigerous segments there are on the dorsal side com- 

 paratively more glands than the original description shows. The capillary setae of the 8 th and 9 th 

 setigerous segments are typical. 



1 Only the anterior parts counted. 



