Gatty Marine Laboratory, St. Andrews. 5 



Fnuvelinpsis * challenger ion y sp. n, 



A rcmarkal)le form drc(l<i;c(l by the 'Challen^'er'' at 

 Station l.ir on tlic 3r(l Alarcli, 1871-, at a depth of 

 1950 fathoms, presents features which aj)|)ear to be unique 

 in the Polychicts. It oecupied a hard brownish tube with 

 blaek grains. The region in which it was found had a 

 bottom of Diatom ooze, and was cliaraeterised by such rare 

 forms as Truphonia rvyvillei, AI'I., Pista udyssicola, M'l., the 

 neighbouring area liarbouring the equally rare Ephesia 

 antarcfica, API., Grubianella antarctica, M'l., and Leana 

 anturctica, M'L, all dwelling in the Diatom ooze. 



The specimen (PI. II. figs. 1, 2, & 3) measures 17 ram. in 

 length, and is rounded, with a pale iridescent cuticle, the 

 marked annulation in front giving it some resemblance to a 

 small earthworm, though posteriorly the imperfect preser- 

 vation and partial collapse give a dilierent as]:)ect. The 

 anterior end is slightly bulbous with a ventral flexure, and 

 presents lateral bristles almost to the tip. The prostomium 

 appears to be rudimentary, and is indistinguishable in the 

 specimen; the flattened ventral eminences on each side of 

 the mouth are probably related to the peristomiura. Dorsally 

 the anterior margin is rounded, but ventrally the two flat- 

 tened eminences probaldy represent the palpi; tlie fissure 

 between them leading apparently to the mouth. The outline 

 of the anterior region dorsally is somewhat ovoid (PI. II. 

 fig. 4), and a constriction occurs behind the first bristle-tuft. 

 The outline then enlarges to the median region and again 

 slightly diminishes posteriorly, where it ends in two acutely 

 pointed papillne — after the manner of some Protodrili, The 

 tissues, however, in this region are pulpy. The body is very 

 definitely segmented, five bristle-tufts occurring in tlie ovoid 

 anterior region, then follows a narrow segment with a much 

 longer antero-posterior diameter, succeeded by others which 

 gradually widen transversely, the last diminishing also in 

 antero-posterior diameter. Next come two well-marked 

 narrower segments, likewise wide transversely, after which a 

 series of less distinct segments more than twenty in number 

 go to the posterior end. 



Dorsally (PL II. fig. 1) the surface is smoothly rounded; 

 but ventrally (PI. II. fig. 2) a median groove — commencing 

 at the moutli — runs backward until it is lost in the softened 

 posterior region. Laterally the body (PI. II. fig. 3) is 

 marked by transversely elongated lozenge-shaped areas 



* Named in honour of Prof. Faiivel, of Augers, who for many years 

 has successfiillv laboured at the Polvchiiets. 



