Clare Island Survey — Archiannelida and Polychaeta. 47 145 



a series of opaque white glands. In the thorax there are two of these glands 

 in each segment, but in the abdominal segments they are divided into four by 

 the ventral furrow. 



Both specimens have 20 setigerous segments, 8 being thoracic and 12 

 abdominal. The first thoracic as usual bears only dorsal capillary setae. 

 Behind the setae of the second setigerous segment is the row of glands which 

 has been noted in other species of the Sabellidae. 



No eyes or otocysts were noted. 



There are five pairs of branched tentacles, and several pairs of unbranched 

 ones, of which one long ventral pair is attached to the connecting membrane, 

 whilst the others are free. Each of the branched branchiae has about 26 

 branches arranged in two rows. The terminal portion (fig. 33c) without 

 branches is - 3 mm. long. The longest unbranched branehia is 1 mm. long, the 

 shorter ones '3 mm. long. 



The collar is wide, and its anterior border is curved outwards. It is 

 dorsally infolded, ventrally only slightly indented. Beneath the collar on 

 the dorsal side, the terminal portions of the thoracic excretory organs show as 

 conspicuous dots. The anal funnel (figs. 33 A, b) is wide, with a much-folded 

 border. It is formed by the four posterior setigerous segments, the first of 

 which forms the anterior border. 



The first setigerous segment bears only dorsal capillary setae, of which 6 

 are long, with conspicuous wings. There is also a second row of shorter, 

 slenderer setae, with curved shafts and delicate wings. 



The other thoracic segments bear dorsally a row of 5 capillary setae, the 

 upper ones (fig. 33d, a) being longer than the lower ones (fig. 33d, b). 

 Beneath these elongate capillary setae is a row of 4-5 spatulate setae, the 

 upper ones having longer blades than the lower ones (fig. 33e). At the base 

 of the spatulate setae is a row of six shorter setae, the basal setae, of 

 characteristic shape (fig. 33f). The shaft, on emerging from the skin, grows 

 rapidly thinner, and shows a double curvature. It is delicately winged on 

 both sides. The corresponding setae in Euchone rosea from Madeira, as 

 figured by Langerhans (1884, Taf. xvi, fig. 35, g), are shorter, thicker, more 

 abruptly curved, and have no wings. In the ventral division of the foot are 

 9 crochets with long stalks (fig. 33g). Behind the main tooth there are 4 

 smaller teeth, and a delicate wing. Below the neck the shaft expands 

 abruptly. 



In the abdominal segments the capillary setae have long, slender, tapering 

 tips (fig. 33k), winged on both sides. 



In the anterior abdominal segments, the uncini (fig. 33h) differ slightly in 

 shape from those in the posterior segments. In surface view the anterior 



R.I, A. PBOC, VOL. XXXI. T il 



