STYLARIOIDES GLAITCA. 97 



48° 26' N., Long. 9° 44' W. (Stat. VI) ; and at Stat. VIII, 257 fathoms, on sand, Lat. 

 48° 18' N, Long. 9° 11' W. 



It is common off Sweden (Loven, Ljungman, Malmgren) ; Norway (Canon Norman) ; 

 Denmark/ Atlantic (Fauvel). 



This species is characterised by its smaller size, 1 — 1J in.; smoother outline, shorter 

 and finer bristles, and more distinctly differentiated segments posteriorly. The body is 

 somewhat clavate in outline, slightly tapered anteriorly, and more distinctly attenuated 

 posteriorly, indeed in some preparations the posterior region forms a narrow, moniliform 

 appendage of about forty segments. In the majority, however, the tail is imperfect, but 

 in a few it tapers to a somewhat blunt cone with the anus in the centre. The body-wall 

 is considerably thinner than in S. plumosa, and the entire animal more delicate. In one or 

 two in which the posterior end had been lost a dilatation of two segments occurred in front 

 of the tail, and then followed a short conical region composed of the reproduced tail. 

 The general surface of the body is much smoother under a lens than in 8. plumosa, yet it 

 is studded with long, clavate, and other papillae (Plate XCVI, fig. 2), and encrusted with 

 minute particles of sand, which give a peculiar dull greyish sheen to the species ; indeed, 

 in spirit, it retains very much the aspect in life, viz. light grey, with a dull bluish region 

 dorsally from the intestine. As in 8. plumosa, the fascicles of both dorsal and ventral 

 longitudinal muscles are visible as separate bands through the integument in the 

 preparations. 



The palpi are finely crenate, flattened, grooved organs — differing in appearance 

 from those of 8. plumosa. Above there are six processes, four in the preparations 

 rather broad and grooved, and two with filiform tips. Thus Malmgren's artist, 

 after all, correctly represented the number, though somewhat imperfectly figuring the 

 palpi. In the text Malmgren corrects the figure, which he states shows four palpi. 

 If all the six above the palpi are branchiae, the difference in form of the two lower with 

 the filiform tips is interesting, for they have no pale streak in the centre. The branchiae 

 in Stylarioides plumosa have only an opaque band in the centre — probably from the blood- 

 vessels. In this species a similar basal process to that in S. plumosa bears the branchiae 

 and palpi, but the two minute brown pigment-specks on the ventral surface are wide 

 apart. 



The majority show only a few of the long anterior bristles which stretch forward from 

 the first body-segment immediately behind the smooth process which projects from the 

 anterior aperture. These are proportionately short and delicate when contrasted with 

 those of S. plumosa, as well as few in number, indeed, in many of the specimens collected 

 in diverse localities they are absent. The translucency of these pale iridescent bristles 

 causes the joints to become very distinct, so that the bristle resembles the stalk of a 

 Conferva (Plate CIV, fig. 9, frontal bristle). The segments are longer than in the 

 bristles of S. plumosa (Ibid., fig. 1 b). The ventral bristles form a short, but yet con- 

 spicuous, tuft below and a little behind the foregoing in the segment. They are short 

 and proportionally thick, with well-marked articulations, and only slightly taper toward 

 the tip, which is distinctly hooked. The succeeding bristles are arranged in a dorsal and 

 a ventral tuft, and both are capillary and articulated, the inferior, however, being shorter 

 and having proportionally longer joints. In proportion to the size of the annelid these 



136 



