EUMENIA JEFFREYSII. 41 



The anatomy of this species was given by Wiren (1887) in his account of the 

 structure of the limivorous polychsetes. 



2. Eumenia (Lipobranchius) Jeffreysii, Mcintosh, 1869. Plate XCV, figs. 6 and 6 a — 



body : Plate CHI, fig. 5 h— bristle. 



Specific Characters. — Head with two short thick tentacles. Body about an inch and 

 a half in length, somewhat fusiform, the greatest diameter being about the anterior third. 

 Rugose tesselated skin as in Scalibregma and Eumenia crassa. No trace of gills. Foot 

 represented by two simple bluntly-conical papillae, bearing finely tapered capillary 

 bristles with shorter furcate forms. Anus surrounded by short papillae. Ventral 

 surface marked by a median groove, which occasionally has a thickened band in the 

 centre. Tubicolous. 



Synonyms. 



1869. Eumenia Jeffrey sii, Mcintosh. Rep. Brit. Assoc, for 1868, p. 337. 



„ „ „ idem. Trans. Roy. Soc. Edinb., vol. xxv, p. 419, pi. xvi, fig. 5. 



1888. Lipobranchius Jeffrey sii, Cunningham and Ramage. Trans. Roy. Soc. Edinb., vol. xxxiii, 



p. 655, pi. xlii, fig. 19. 

 1894. „ „ De St. Joseph. Ann. Sc. nat., 7 e ser., t. xvii, p. 103. 



1896. „ „ Benham. Camb. Nat. Hist., vol. ii, p. 334. 



1908. Eumenia (Lipobranchius) Jeffrey sii, Mcintosh. Ann. Nat. Hist., ser. 8, vol. i, p. 380. 



1909. Lipobranchius Jeffrey sii, Ashworth. Fisheries Ireland Sc. Invest., 1908, ii, p. 3. 



Habitat. — Off the Hebrides in a lengthy tube, 1866, and off Shetland, 1867 

 (Dr. Gwyn Jeffreys). Firth of Clyde, where it lives in a thick tube of mud and 

 secretions (Cunningham and Ramage). Abroad it occurs off Norway (Canon Norman). 



Head small, furnished with two short thick tentacles, which give it a bilobed aspect, 

 and in the preparations it is generally retracted within the papillose anterior region. In 

 retraction the peristomial segment forms a papillose frill encircling the head dorsally. 

 The mouth opens on the ventral surface just behind the snout, and the papillae are 

 somewhat symmetrically arranged around it, two prominent — one on each side of the 

 middle line — occurring in front, and two in a similar position posteriorly, the rest 

 diverging obliquely from the transverse slit of the mouth in contraction. 



Body (in spirit, Plate XCV, fig. 6) of about thirty segments, an inch and a half in length, 

 somewhat fusiform in outline, the greatest diameter being at the anterior third. The 

 structure of the skin and the arrangement of the rugose annulations resemble the same 

 parts in Travisia, Scalibregma, Eumenia crassa, and their allies, but it differs essentially 

 from each of the foregoing in having no trace of branchial filament or appendage. Each 

 segment has three rings, which present the corrugated and tesselated surface, a condition 

 especially evident anteriorly and posteriorly, but probably general in life. The body 

 diminishes a little posteriorly, and then more abruptly in front of the anus, which is 

 terminal and surrounded by a series of short papillae. The ventral surface is marked by 

 a median groove, which sometimes has a thickened band in the centre. 



The feet are represented by a double row of isolated papillae which run on each side 



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