A7T2 PARAONIS LYRA. 
HUMENIA HystRIcIs, Welntosh, 1922. 
SYNONYM. 
1922. Humenia hystricis, McIntosh. Ann. Nat. Hist., ser. 9, vol. ix, p. 3. 
Dredged in the Channel slope at Station 8, “ Porcupine” Expedition, 1870, at a depth 
of 257—690 fathoms, amidst a fauna chiefly northern. 
A fragment devoid of the anterior region, resembling a curved larva of an insect, of a 
rounded form, and apparently thickest posteriorly, for it tapers anteriorly, where the seg- 
ments are longer, and closely rmged throughout the rest of its extent. Hach seement bears 
two short gills, thus differing from Humenia crassa or H. Jeffreys, and they are longest 
behind the middle and diminish in the caudal region. They spring apparently from the 
posterior edge of each segment-junction, and generally in the preparation present a somewhat 
club-shaped outline, with a firm cuticular investment having a finely granular hypoderm 
beneath. They are marked by transverse strize, probably due to the circular fibres, whilst 
internally is a large blood-vessel, which may form a loop distally, though the state of the 
specimen rendered this uncertain. Some of the gills contained large granular cells, but 
the nature of these has not been ascertained. 
The segments are simple—-that is, without rings—each dorsally shghtly overlapping 
the anterior edge of the succeeding segment, and from the curve of the body the dorsal antero- 
posterior diameter is wide, the ventral narrow. The posterior segments become increasingly 
narrow, and terminate in the anus, which has beneath 1¢ two papille. The dorsal surface 
of the body is convex; the ventral presents a slightly flattened surface, with a shallow groove 
posteriorly. The cuticle, moreover, by dipping in formed a series of reticulations, which 
here and there were arranged in long rows. 
A remarkable feature was the apparent absence of bristles, no trace of which was observed 
until the fragments were put in xylol, when a vertical row of minute points—apparently 
the bases of bristles, though at first sight resembling minute uncini, was observed. The 
arrangement of the gills at once distinguishes this species from Humensa crassa, Cirst., and 
BE. Jeffreys, Mcl. 
Faminy Paraontpa, Ceruttr, 1909. 
Marine annelids with numerous segments, median sensory process anteriorly ; median 
tentacle ; two eyes; nuchal organs; metastomial region with bristles; branchie from the 
third to the sixth segment ; modified (lyrate) bristles in the posterior dorsal tufts. 
PARAONIS LYRA, Southern, 1914. Plate CXX XVI, fig. 3—bristle. 
Specific Characters—Head somewhat bluntly conical, with a low rounded papilla 
bearing stiff cilia on the tip, and having yellowish pigment. Nuchal organs brownish, large 
and conspicuous, sloping obliquely backward and inward from the mid-lateral region. 
Body widest in the middle, tapering toward each end, 20 mm. long, and with 95—105 
segments. Three anterior segments have capillary bristles and small dorsal cirri, but the 
