REPORT ON THE ANNELIDA. 
335 
Generally the anterior feet are characterised by the presence of two long hooks, which 
at the tenth have attained considerable development, though the tip is smaller than in 
the posterior forms. The upper hook in each foot has, indeed, a less developed crown 
than the inferior (PI. XXIa. fig. 18). They approach in most respects those of Kinherg’s 
Onuphis setosa. The winged bristles of the Challenger form, however, are short and 
comparatively feeble. The brush-shaped bristles generally show an oblique tip, probably 
due in some cases to position. The species differs from Kinberg’s form [Onuphis setosa) 
in the absence of branchiae. 
No styles are attached to the tail, having probably been lost, and there is no tul)e 
in connection with it. ^ 
In sections of the body- wall the structure is nearly typical. The cuticle is compara- 
tively thick, except over the great hypodermic lateral pads in the glandular region. 
The nerve-cords are outlined in the area, and the ganglia are large. A minute neural 
canal appears in the usual position interiorly. 
The general aspect of the tentacles and anterior region, the structure of the dental 
apparatus and other points, show a closer resemblance to Nothria than to Hyalincecia. 
Hyalinoecia, Malmgren. 
Hyalincecia tubicola, 0. F. Muller. 
Habitat. — Small specimens were dredged at Station 75 (off Fayal, Azores), July 2, 
1873; lat. 38° 38' N., long. 28° 28' 30" W.; depth, 50 to 90 fathoms; surface tem- 
perature, 70°; sea-bottom, volcanic mud. 
Another small specimen, trawled at Station 235 (a little south of Japan), June 4, 
1875 ; lat. 34° 7' N., long. 138° O'E. ; depth, 565 fathoms; bottom temperature 38°J, 
surface temperature 73° ’0 ; sea-bottom, green mud. 
This form has a very wide range. 
In the examples from the first locality the branchiae commence on the twenty-second 
foot, and eyes are present. The dental armature is typical. Thus the left great dental 
plate has thirteen, the right twelve teeth ; the left lateral paired plate seven or eight, 
left unpaired fourteen, and right lateral eight or nine teeth. The mandibles as usual 
have the outer dental edge directed forward. The muscular band passing trausversely 
between the feet and touching the summit of the nerve-cord is well marked. 
The example from the second locality has been dried, but so far as can be made 
out it corresponds with the typical form. The left great dental plate has thirteen teeth, 
the right the same number ; left paired plate ten, left unpaired twelve, right lateral twelve. 
