REPORT ON THE ANNELIDA. 
239 
is of considerable importance, and it is probable that another genus may be necessary for 
those species with the bifid posterior processes. 
Lumhriconereis, Blainville, char, emend. 
Lumhriconereis pettigrewi,^ n. sp. (PL XXXVI. figs. 7, 8, 9 ; PI. XVIIa. figs. 11-15). 
Habitat. — Dredged at Station 141 (off the Cape of Good Hope), December 17, 1873 ; 
lat. 34° 41' S., long. 18° 36' E.; depth, 98 fathoms; bottom temperature 49°'5, surface 
temperature 6 6° ’5 ; sea-bottom, green sand. 
A species about 100 mm. in length and nearly 2 ‘5 mm. in breadth; apparently in 
considerable abundance. 
In external appearance it very much resembles Lumhriconereis fragilis, 0. F. Muller, 
but, as the specific distinctions rest on so many minute points, little reliance can be 
placed on the former. 
Viewed from the dorsum, the head (PL XXXVI. fig. 7) forms a somewhat pointed 
cone, generally with a median groove or depression, which, however, does not reach the 
apex. At the sides posteriorly the ventral “bosses” often project a httle beyond the 
margin. A few longitudinal streaks occur on the ventral surface. In the buccal segment 
the oral margin is deeply crenate, and marked by longitudinal lines. From the boss on 
each side a ridge proceeds backward and inward on the roof of the mouth, and the two 
are separated by a deep groove. 
The maxillae (Fig. 4) are dull brownish, and the spathulate processes posteriorly 
(Fig. 5) are blackish-brown. The great dental plate on each side presents four teeth. 
The lateral plates, which are arranged transversely in front, are terminated dorsally by 
a prominent tooth, the outer (and larger) plate having the longer. These teeth turn 
inward when the sides of the dental apparatus are drawn together. Close behind the 
outer lateral tooth is a small horny patch, followed after an interval by a longer bar 
running backward to the posterior third of the maxilla on each side. The halves of the 
mandible (Fig. 6) are ankylosed anteriorly, and have a broad V-shaped ventral surface, 
the dark and nearly parallel lines passing from side to side continuously. 
The feet are similar to those of the Norwegian examples of Lumhriconereis fragilis, 
but the bristles are less developed, and do not possess the blackish-brown tinge in their 
shafts. The contour of the upper part of the lobe is also difierent, and there ere only 
three black spines in the Challenger form, whereas in the European there are five or six. 
The groups of bristles, however, are about the same number in the tenth foot (PL XXXVI. 
fig. 8) of each, viz., five, the upper (PL XVIIa. fig. 11) being the longer. In Lumhri- 
^ Named after my colleague, Prof. Pettigrew, well known for his anatomical researches and for his elaborate 
investigations on flight. 
