BANSE: RBDESCRIPTIONS OF SOME SPECIES OF CHONE AND EUCHONE 



distinguished by the larger number of radioles 

 with long slender ends, and especially the form 

 of the anterior abdominal uncini. Further, the 

 incision of the ventral shield at the level of the 

 first parapodium is very short in E. rubrocincta 

 (see also E. analis, p. 483). E. rosea Langer- 

 hans, as described by Banse (1970) for speci- 

 mens from the Ivory Coast, is very similar in 

 regard to the tips of the radioles, the collar, the 

 subspatulate notosetae, and especially the ab- 

 dominal uncini. However, the ventral shield on 

 the first setiger is not divided, and the number 

 of anterior abdominal setigers is only 10 or 11, 

 and that of the anal depression only 6. The 

 smaller number of radioles in the African ma- 

 terial may be due to their smaller size. 



The distribution of the species is not well 

 known. Material of Southern (1914) and South- 

 ward (1956) collected around Ireland has been 

 treated above. The specimens of Malmgren 

 (1866) from the Skagerak and Mcintosh (1916, 

 1923) from the Shetlands are certainly E. ru- 

 hrocincta. The species is also reported from the 

 Mediterranean Sea (cf. Fauvel, 1927) , but I have 

 not searched the literature for Lusitanian and 

 more southern records. Also, the reports of E. 

 mbrocincta from the northwest Atlantic by 

 Moore (1909) and Baillie (1946) should be 

 checked because of the possible confusion with 

 E. elegans treated below. The former author 

 did not give any reference for identification ; the 

 latter referred to Malmgren's description, 



EUCHONE ELEGANS VERRILL 



Figure lla-e 



EUCHONE ELEGANS Verrill, 1873, p. 618.- 

 Hartman, 1944a, p. 334 (with other referen- 

 ces). 



Diagnosis: A Euchone species with ventral 

 shields, with 12 to 15 anterior abdominal setigers 

 and 8 to 10 setigers in anal depression. Six to 

 eight pairs of radioles, united by palmate mem- 

 brane for about half their length, and rather 

 broad and free ends. Three to four pairs of nude 

 filaments. Collar level, with small ventral notch. 

 Lower thoracic notosetae subspatulate. Marked 

 divergence of uncini within tori of anterior ab- 



domen; ontogenetically recent uncini with broad 

 bases and small posterior extension; old uncini 

 with rounded bases and high crowns, similar 

 to those in depression. 



Material studied: Syn types, collected from 

 Block Island Sound, Mass., in 1871. USNM 7513, 

 5 specimens. 



Cape Cod Bay, Mass., SEP station 1412 E5, 

 lat 41°55.0'N, long 70°08.5'W, 33 m, muddy sand, 

 11 June 1968. SEP, 4 specimens. Unpublished 

 record. 



Cape Cod Bay, Mass., SEP station 2318 Ep, lat 

 41°45.0'N, long 70°06.5'W, 16 m, sand, 13 Oct. 

 1966. SEP, 22 specimens. Unpublished record. 



Additions to the Description: The available 

 specimens are up to 1 cm long; about one-third 

 of the length is contributed by the branchial 

 crown. Verrill (1873) observed animals up 

 to 2 cm long. Most of the branchial crowns 

 have seven pairs of radioles with up to 

 3 doz pinnules each and three to four pairs of 

 ventral nude filaments; one pair of these is about 

 as long as the radioles. The free ends (Figure 

 11a) contribute about one-sixth of the total 

 length of the radioles. The collar is of equal 

 height dorsally and ventrally and has only a small 

 ventral notch. Segments are biannulate, partic- 

 ularly in the thorax. A postsetal girdle of glands 

 is present on the second setiger. Ventral shields 

 are moderately visible in unstained material in 

 the thorax and anterior abdomen but stand out 

 clearly upon staining. In the syntypes, the num- 

 ber of abdominal setigers is 13 (12 in one) fol- 

 lowed by 1 transitional and 8 depression setigers. 

 In the 10 SEP specimens, up to 9 mm long, 15 

 setigers are present prior to the beginning of 

 the depression in 7 specimens; 14 setigers in 2 

 specimens; and 14 or 15 in 1 specimen. The 

 anal depression extends through 10 setigers in 

 the largest animals. 



The thoracic notopodia are almost as conspic- 

 uous as in E. rub7^ocincta (cf. Figure lOd) . Each 

 contains long limbate, short bayonet-type, and 

 subspatulate (Figure lib) setae, totaling less 

 than a dozen. Each neuropodium has about 10 

 long-handled hooks. The uncini of the anterior 

 abdominal segments (Figure lie) have a broad 



487 



