Gatty Marine Laboratory, St. Andrews. y 
Fauveliopsis * challengeria, sp. n. 
A remarkable form dredged by the ‘Challenger’ at 
Station 157 on the 8rd March, 1874, at a depth of 
1950 fathoms, presents features which appear to be unique 
in the Polychets. It occupied a hard brownish tube with 
black grains. The region in which it was found had a 
bottom of Diatom ooze, and was characterised by such rare 
forms as Trophonia wyvillei, M‘I., Pista abyssicola, M‘I., the 
neighbouring area harbouring the equally rare Kphesia 
antarctica, M‘I., Grubianella antarctica, M‘I., and Leena 
antarctica, M‘I., all dwelling in the Diatom ooze. 
The specimen (PI. II. figs. 1, 2, & 3) measures 17 mm. 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 different aspect. 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 peristomium. Dorsally 
the anterior margin is rounded, but ventrally the two flat- 
tened eminences probably represent the palpi, the 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 papille—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 the 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 (Pl. II. fig. 2) a median groove—commencing 
at the mouth—runs backward until it is lost in the softened 
posterior region. Laterally the body (Pl. II. fig. 3) is 
marked by transversely elongated lozenge-shaped areas 
* Named in honour of Prof, Fauvel, of Angers, who for many years 
has suecessfully laboured at the Polychets. 
