FISHERY BULLETIN: VOL. 70, NO. 2 



the total length in the syntypes and in Southern's 

 material. 



In the syntypes, the collar is of equal height 

 dorsally and ventrally and has only a small ven- 

 tral notch (Figures 10b and c). Setigers are 

 biannulate, which is especially obvious in the 

 thorax. In the three syntypes, there are 11 an- 

 terior abdominal, 1 transitional, and 11 depres- 

 sion setigers; 15, 1, 9; and 12, 0, 10 setigers, 

 respectively. Ventral shields are distinct in the 

 thorax and abdomen as depicted by Malmgren 

 (1866, Plate 29, Figure 91). 



The thoracic notopodia (Figure lOd) are very 

 conspicuous; each contains about a dozen each 

 of long limbate, short bayonet-type (Figure lOe) , 

 and subspatulate (Figure lOf) setae. The long 

 limbate setae originate above the semicircular 

 lip shown in Figure lOd which is about 0.2 mm 

 long; the other two kinds below it. Each neuro- 

 podium contains approximately II/2 doz of long- 

 handled hooks of the usual form (cf. Mcintosh, 

 1923, Plate 131, Figure 2a). The uncini of the 

 anterior abdomen (Figure lOg; cf. Figure lOj) 

 do not have the squarish basis usually found in 

 Euchone species but have a slim neck and a large 

 posterior extension making them almost S- 

 shaped. Even the dorsalmost ones in the tori 

 studied have essentially this outline. Only a few 

 columns of teeth are found in these uncini. The 

 uncini of the depression segments are formed as 

 shown in Figure lOh; they have approximately 

 eight columns of teeth, and the number of rows 

 is 12 to 14. The number of uncini is about 2 doz 

 per torus anteriorly in the abdomen and in me- 

 dian segments of the anal depression. The ab- 

 dominal capillary setae are arranged in two se- 

 ries per neuropodium. 



After using methyl green, the collar (Figure 

 lOc) is lightly stained except for a ventral un- 

 stained area and, in some animals, a diffuse band 

 anterior to it. The thoracic ventral shields are 

 clearly marked. Laterally strongly staining 

 areas are found posterior to and, to a lesser de- 

 gree, anterior to the thoracic parapodia. In the 

 last thoracic segments, these areas touch the 

 ventral shields but do not continue onto the dor- 

 sal side, except as traces. In the abdomen, how- 

 ever, the stained cells form two girdles around 

 each segment, interrupted only by the fecal 



groove; the presetal ring, which may appear 

 dorsally as whitish glandular tissue even in un- 

 stained material, stains more strongly than the 

 postsetal one. The ventral shields are not mark- 

 edly darker after staining than the lateral and 

 dorsal parts. The intersegmental unstained fur- 

 rows disappear gradually in the depression seg- 

 ments. 



In the material from northwestern Ireland, 

 the largest animal, a mature male, is almost 2.5 

 cm long, of which about one-third is contributed 

 by the branchial crown; the smallest specimen 

 is 1.5 cm long. The latter has 11, the former, 

 15 pairs of radioles, with about 4 doz pairs of 

 pinnules each. In all specimens, there are 12 

 anterior abdominal setigers, the twelfth some- 

 times appearing to be a transitional segment, 

 and 10 to 12 depression segments. The notopo- 

 dia (cf. Figure lOd) appear to be divided into 

 anterior and posterior lips, rather than form one 

 semicircular fold. Limbate and subspatulate 

 notosetae are shown in Figure lOi; the total 

 number of notopodial setae is 2 doz. The other 

 characters agree with the syntypes. 



No color is left in the syntypes of the Irish ma- 

 terial, but Southern (1914) stated that the bright 

 red bands, which gave the species its name, were 

 present in Formalin-preserved material until the 

 transfer into alcohol. Sars (1862) observed one 

 purple ring on each segment. 



Mcintosh (1916) reported on animals with 

 15 to 16 pairs of radioles. It must be noted that 

 Mcintosh's description (1916, also 1923) of other 

 features of the branchial crown contains quo- 

 tations of Southern's (1914) text for E. rosea. 



Southward's specimens are small, up to 7 mm 

 long. Two have 11 anterior abdominal setigers, 

 and one transitional setiger; the third animal 

 has 13 or 14 anterior abdominal setigers. An 

 uncinus from this region (Figure lOj) has a 

 broader neck than the material treated above but 

 otherwise has the same characteristic form. The 

 staining pattern is as described by the syntypes 

 as far as this can be recognized in the previously 

 dried specimens. 



Remarks: Euchone rubrocincta is close to 

 the smaller E. elegans Verrill from which it is 



486 



