252 
THE VOYAGE OF H.M.S. CHALLENGEE. 
iMmhriconereis punctata, n, sp. (PI. XXX. fig. 9; PI. XVIIIa. fig. 11). 
Habitat. — Dredged at Station 45 (off the American coast, near New York), May 3, 
1873 ; lat. 38° 34' N., long. 72° 10' W.; depth, 1240 fathoms ; bottom temperature 37°'2, 
surface temperature 49° '5 ; sea-bottom, blue mud. 
A fragmentary specimen, measuring about 20 mm. in length and about 2 mm. in 
breadth. 
The general aspect of the animal differs from that of Lumhriconereis fragilis in 
having much longer bristles and a more pointed snout. Besides the acuteness of the 
latter (PI. XXX. fig. 9), a further characteristic is the presence of about six brown 
pigment-spots symmetrically arranged, three on each side of the middle line, toward the 
posterior border of the head. Moreover, on the ventral surface a conspicuous dark 
pigment-speck exists in each of the anterior oral folds. The dorsal pigment-specks in 
the preparation are hardly so distinct as eye-specks, and may be the remnants of pigment- 
streaks. The head both dorsally and ventrally is marked by longitudinal streaks. 
The maxillse (Fig. 19) have a marked constriction in front of the posterior spathulate 
processes, each of which is almost semicircular. The left great dental plate shows only 
two large teeth ; the right has a terminal tooth, and posteriorly, after 
an interval, two others, besides an elevated ridge following the latter. 
The lateral plate immediately in front is wedge-shaped, with a single 
tooth. The anterior plate is somewhat rhomboidal, with a single iDlack 
tooth next that of the adjoining plate. There is no sinus next the 
tooth, and apparently no accessory plate. The ventral dentary surface 
of the mandibles is similar to that in the foregoing species, but more 
acute externally. There are three teeth on the anterior margin on each 
side of the middle line, besides an elevated ridge externally. 
The shape of the soft parts of the feet does not differ in a material 
manner from those of Luinbriconereis fragilis, except, perhaps, in being 
a little more produced. The bristles and hooks, however, are much 
longer throughout. At the tenth foot the posterior lobe is more 
pointed than in the common species, resembling in this respect Lum- 
hriconereis ahyssorum. The l^ristles are pale, more slender, and less 
numerous than in Lumhriconereis fragilis, and the spines are not black. At the thirtieth 
foot, again, the long dorsal bristles far exceed in length those of the species just men- 
tioned, and the wings in the longest are rudimentary. 
At the fiftieth foot the American form still has two attenuate bristles below the 
elongate superior one, and the hooks are more slender, and difter in the character 
of their serrations at the tip, from those of Lumhriconereis fragilis. The curvature at 
Fig. 19. — Maxillse and 
dental plates of Lum- 
hriconereis punctata, 
from the dorsal sur- 
face : X 90 diameters. 
