340 
THE YOYAGE OF H.M.S. CHALLENGER. 
What appears to be the same form (PL XL. fig. 3) was trawled at Station 168 
(a little west of the northern island of New Zealand), July 8, 1874; lat. 40° 28' S., 
long. 177° 43' E. ; dej)th, 1100 fathoms; bottom temperature 3 7° '2, surface tempera- 
ture 57°‘2; sea-bottom, blue mud. It is a small species. 
The head has a slender median tentacle which is almost a third longer than the 
adjoining pair, the latter being likewise slender and tapered. The external pair, on the 
other hand, are comparatively thick, short, and blunt, being only about a quarter the 
length of the adjoining pair. The palpi in front are rounded and almost united, the 
species differing in this respect from its allies ; indeed from the dorsal aspect a slight 
notch alone indicates their separation, while on the ventral surface this region presents 
even a more striking divergence from such a form as Hycdincecia tiibicola, in its great 
antero-posterior length, its differentiation only by a median groove, the indistinctness 
of the ]3alpi, and the absence of median antennse in front. 
The minute size of the dental apparatus and the state of the specimen are inimical to 
accurate description. The type seems to conform to that of Hyalincecia tubicola. A. 
feature of interest is the occurrence of a conspicuous blackish band in the mandible on 
each side of the symphysis and extending far backward. The same is seen in the 
specimen from Station 158. 
In the sections of the body- wall no transverse muscle is seen, but the small size of the 
specimen renders such features less reliable. So far as could be observed, the muscles- 
are siniilarj but they are less bulky. 
No branchise are seen. 
The first foot bears a series of long bristles (which, however, do not project much 
beyond the soft tissues) with a bifid tip and wing. One from the margin of the dried 
example is shown in PI. XXIa. fig. 16. In the smaller fresh specimens the bristles seem 
somewhat larger and more slender, but with the same outline. 
The feet had the usual structure, and the pair of long slender hooks quite agree with 
that figured above (from the twentieth foot). 
The tail is terminated by two slender styles. 
The body of the animal is comparatively short, but the posterior end appears to have 
I)een recently reproduced. 
The tube is a semitransparent chitinous one of the ordinary shape. 
J'he intestinal canal had a fragment of the jaw of one of the Eunicidse apparently like 
Aracoda or Drilonereis. 
Hyalincecia bilineata, Baird. 
Hyalinoecia hilineata, Baird, Jouru. Linn. Soc. Lond., vol. x. p. 358. 
Habitat. — Dredged in the “Knight Errant,” Station 3, August 3 and 4, 1880; lat. 
59° 12' N., long. 5° 57' W. ; depth, 53 fathoms (off the Island of North Kona). 
