BANSE: REDESCRIPTIONS OF SOME SPECIES OF CHONE AND EUCHONE 



Addition to the Description: The specimen is 

 complete. The length of the trunk is about 15 

 mm, that of the branchial crown approximately 

 4 mm. The branchial crown consists of some 

 ventral nude filaments (5 to 10 pairs according 

 to Kroyer, 1856, and Malmgren, 1866) , and 10 

 pairs of radioles bearing pinnules and connected 

 by a palmate membrane. The ends of the radi- 

 oles are like those of E. elegans (cf. Figure 11a) . 

 The collar has a small ventral incision. The sec- 

 ond setiger is ringed by a postsetal girdle of 

 glands. Segments are biannulate up to the anal 

 depression. There are 17 anterior abdominal 

 segments and 9 setigers in the anal depression. 

 Ventral shields are present in thorax and ab- 

 domen. The shields of the first segment and first 

 setiger are divided by intrasegmental furrows 

 which do not stand out as whitish lines after 

 staining. In the abdomen the shields have the 

 form depicted by Malmgren (1866, Plate 28, 

 Figure 88). 



The notopodia, including the large first one, 

 have conspicuous lips of the same form as E. 

 rubrocincta (cf. Figure lOd) . The bayonet-type 

 setae have shafts almost as thick as the sub- 

 spatulate ones (Figure 9a) behind them and are 

 terminally thin, as usual. Anterior abdominal 

 uncini (Figure 9b) are all alike within the tori; 

 each has a squarish basis and a crown of about 

 10 rows of accessory teeth in several columns. 

 The bases of the posterior uncini (Figure 9c) 

 are similar but the crowns have about 15 rows 

 of teeth in approximately a dozen columns. 



After staining, the ventral shields and, sep- 

 arate from them, areas before and behind the 

 parapodia are conspicuous in thorax and abdo- 

 men. The first setiger does not seem to be sep- 

 arated from the preceding and following seg- 

 ments by nonstaining lines, nor is the intraseg- 

 mental furrow distinct. The intrasegmental 

 furrow on the second setiger resembles that of 

 E. rubrocincta (Figure 10c). Dorsally, the tho- 

 rax and the anterior segments of the abdomen 

 are essentially free of stain-accepting cells. In 

 middle and posterior abdominal setigers, presetal 

 broad rings are complete; they are visible as 

 whitish tissue also in the unstained animal. 



Remarks: This specimen has 17 anterior ab- 



dominal setigers, fewer than stated by Malmgren 

 (1866, about 19) and Berkeley and Berkeley 

 (1952, 20 to 22) but similar to Kroyer (1856, 

 about 16). More material must be studied in 

 order to see whether the number of anterior ab- 

 dominal setigers overlaps those of the similar E. 

 elegans and E. rubrocincta. If so, a probably 

 reliable difference of E. analis from the others 

 will be the form of the anterior abdominal uncini. 

 The record by Imajima (1963) from the west 

 coast of Kamchatka is not this species because 

 of the low number of anterior abdominal setigers 

 and the high number of segments in the anal 

 depression. 



EUCHONE PAPILLOSA (SARS) 



Figure 9d-h 



SABELLA PAPILLOSA Sars, 1851, p. 203. 

 EUCHONE PAPILLOSA.- Malmgren 1866, p. 

 407.- Hofsommer, 1913, p. 327.- Augener, 

 1928, p. 805 (synonymy).- Evenkamp, 1931, 

 p. 412.- Pettibone, 1956, p. 578 (synonymy) .- 

 Kuhlmorgen-Hille, 1963, p. 51.- Hartmann- 

 Schroder, 1971, p. 521. 

 SABELLA TUBERCULOSA Kroyer, 1856, p. 



18. 

 EUCHONE TUBERCULOSA.. Malmgren, 1866, 

 p. 407. 



Diagnosis: A large Euchone species with 

 ventral shields, with at least 21 abdominal se- 

 tigers; 8 to 10 form anal depression. Ten to 15 

 pairs of radioles connected for approximately 

 one-half their length by palmate membrane, with 

 long filiform free ends. Two to five pairs of 

 ventral nude filaments. Collar oblique, with mid- 

 ventral incision, scarcely concealing the branchi- 

 al basis. Very conspicuous round fields of glands 

 ventrally in abdomen. Spatulate setae with very 

 long tips. Uncini of anterior abdomen with small 

 crowns of teeth and bases with posterior exten- 

 sion; markedly higher crowns in posterior ab- 

 domen. 



Material studied: Kiel Bight, western Baltic 

 (unknown locality). Collected and identified by 

 G. Kiihlmorgen-Hille (cf. Kiihlmorgen-Hille, 

 1963). Part of sample, USNM 45390, 6 speci- 

 mens. 



483 



