400 
THE VOYAGE OF H.M.S. CHALLENGER. 
the tip in some of these has a hastate outline, from a constriction and then a dilatation. 
The dorsal bristles are similar. The ventral hooks, again (PI. XXIVa. fig. 20), quite 
difier in the shape and denticulations of the crown, and in the general contour of the 
shoulder and shaft, from the previous species as well as Nicomache lumhricalis. About 
five distinct teeth and traces of a sixth occur above the great fang, so that the crown 
is peculiarly elongate. The shoulder is very distinctly marked. 
Mud rich in Diatoms, minute spicules of sponges, the peculiar elongated cylindrical 
spicides with the pointed ends, and fragments of various kinds, occurred in the intestinal 
canal. 
The ])ody-wall of this species offers certain peculiarities. Thus while the cuticle and 
hypoderm have average development and the position and structure of the nerve-area are 
typical, the muscular coats are greatly diminished in bulk. The circular forms only a 
linear band round the body. The longitudinal ventral muscles are limited in area, and 
present a series of almost isolated fasciculi. The longitudinal dorsal also consist of a thin 
layer of similar fasciculi. The oblique muscles are well marked, and are fixed ventrally 
over the outer border of the nerve-area. The blood-vessels are of large size, and tlie 
|)erivisceral corpuscles have the usual mulberry-appearance. 
Nicomache (1) henthaliana (PI. XLVI. fig. 8 ; PI. XXIVa. fig. 21). 
Habitat . — Trawled at Station 241 (in the Pacific, west of Japan), June 23, 1875; 
hit. 35° 41' N., long. 157° 42' E. ; depth, 2300 fathoms; bottom temperature 35°‘l, 
surface temperature 69°*2 ; sea-bottom, red clay. 
Only the funnel and a few adjoining segments are present. 
The terminal cup or funnel is of a more delicate structure than usually seen, and 
shows twenty-two teeth of a lanceolate form, and arranged very closely. IMoreover. 
grooves run between each, so that they possess a peculiar distinctness, especially as the 
funnel is semitranslucent. Three bristled segments exist in front of the funnel, besides 
the penultimate (if the space with an unarmed lateral eminence be such). In regard to 
the latter arrangement, therefore, the fragment approaches Nicomache rather than 
l^raxilla, and the structure of the hooks (PI. XXIVa. fig. 21) tends in the same direction. 
Five rapidly diminishing teeth occur above the great fang, only three, however, being 
ilistinctly seen, and the crown is comparatively little develoj^ed — a contrast to the 
condition in such as those of Nicomache japonica in fig. 20 of the same plate. The fibres 
(vibrissae) arise a very short distance below the great fang, and there is a comparatively 
slight constriction above the shoulder. Indications of a lateral series of teeth appear at 
the bases of the larger fangs. The hooks are decidedly larger than in Praxilla. 
The funnel approaches that of Praxilla rather than that of Axiothca. 
