34 SCALIBREGMA INFLATUM. 



Hansen 1 (1879) describes two new species from the Norwegian Expedition of 1876 

 viz. Scalibregma abyssorum and S. parva, the snout of the former being rounded, and the 

 bifid bristles of both being represented as smooth between the forks— an abnormal con- 

 dition. The form of the foot, which has dorsal and ventral projections of the setigerous 

 processes, approaches that in 8. inflatum. 



1. Scalibregma inflatum, H. BathJce, 1843. Plate LXXXVIII, fig. 4; Plate GUI, 

 figs. 7 — 7b — capillary and forked bristles. 



Specific Characters. — Head truncated anteriorly with a lateral tentacle on each side. 

 Two frilled nuchal organs. Body, in large examples, about three inches in length, some- 

 what fusiform, though at the anterior third the enlargement is greatest, abruptly tapered 

 anteriorly and more gently diminished posteriorly. Convex dorsally, with a depressed 

 mid-ventral line from end to end in the preparations. Segments sixty-three or more. It 

 is closely ringed and tesselated. Segments of four rings, the exceptions being the four 

 anterior segments, the third bearing the foot. The last four have no feet. Posteriorly 

 is a papillose vent with four or five cirri ventrally. Four to five pairs of branchiae, 2 

 commencing on the second bristled segment and increasing in size from front to rear. 

 Proboscis a somewhat short, lobular organ — often with a truncate tip. Feet in front 

 represented by a pad bearing the dorsal and ventral papillae with the bristles. About the 

 sixteenth or eighteenth bristled segment the feet become more prominent, a small dorsal 

 cirrus occurring above the setigerous lobe, by-and-by a ventral cirrus likewise 

 appears, and both assume considerable prominence posteriorly. A retractile sensory 

 papilla, midway between dorsal and ventral lobes of the foot. 



Bristles long, translucent, simple and tapering, and shorter bifid forms with spines 

 in the fork. 



Synonyms. 



1843. Scalibregma inflatum, H. Rathke. Nova Acta Acad. Leop.-Car., xx, i, p. 184, Tab. ix, 



figs. 15-21. 

 1846. Oligobranchus roseus, Sars. Fauna Litt. Norveg., i, p. 91, Tab. 10, figs. 20 — 27. 



,, ,, groenlandicus, idem. Ibid., p. 92. 



1851. Scalibregma inflatum, Grube. Fam. Annel., pp. 71 and 135. 

 1853. „ roseum (Oligobranchus) , Sars. Nyt Mag. f. Naturvid, vii, p. 381. 



„ „ ,, idem. Ibid., vii, p. 381. 



inflatum, Danielssen. Reise, 1858, Norske Yidensk. Skriffc., iv, p. 121. 

 idem. Reise, 1857, Nyt Mag. f. Naturvid., xi, p. 54. 

 Kolliker. Kurzer Bericht, pp. 12 and 14. 

 De Quatrefages. Annel., t. ii, p. 268. 

 Malmgren. Annul. Polych., p. 77. 



Wiren. Kongl. svenska Yet. Akad. Handl., t. xxii, text and Taf. ii, 

 figs. Hand 15; Taf . iii, fig. 1. 



1 ( Nyt Mag. f. Naturvid./ Bd. xxix, p. 6, pi. v. 



2 Dr. Ashworth gives four as the number, but he had not the advantage of seeing living speci- 

 mens, ( Quart. Journ. Micr. Sci./ vol. xlv, n.s., p. 243. 



i85y. 



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1861. 



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1864. 



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1865. 



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1867. 







