272 
THE VOYAGE OF H.M.S. CHALLENGER. 
terminal part of the wing is frequently abraded. In others the wing or guard projects as 
a slight process beyond the tip of the distal fang, and has a rib or thickened band along 
its dorsal edge. In some the entire wing has been removed by friction. 
About the forty-fourth somite one or two hooks occur inferiorly in each foot. They 
are likewise yellowish, have a large fang, a bifid crown, and guards or wings at the tip. 
In some of the posterior feet hooks with three processes exist (PI. XIXa. fig. 13), and it 
would appear from the minute structure of those in front that these also occasionally 
occur throughout. 
The food consists of minute Algse and muddy debris containing fragments of Crustacea, 
sponge-spicules, Foraminifera, and Diatoms. Firm ovoid pellets are formed in the sac- 
culations of the posterior region of the alimentary canal. 
Two fragments of the anterior region (measuring from 8 to 9 mm. in diameter), 
apparently of the adult of the same species, occurred with the others. These somewhat 
differ in regard to the branchiae, which, though commencing on the fourth foot as in the 
foregoing case, soon exhibit a greater number of branches. Thus at the tenth foot there 
are thirteen or fourteen divisions. The tentacle is proportionally shorter, being only a 
little longer than the antennae. The colour of the dental apparatus is dark brown, 
the basal spathulate plate of the maxillae being blackish. In regard to the number of 
teeth on the various plates, these larger forms quite agree with the smaller. The maxillae, 
however, show a characteristic median ridge at the tip (PI. XXXVII. fig. 20), and at 
the lateral edges are also furnished with a prominent keel ; indeed, the shape is peculiar. 
The differences in colour and in the development of the hard ridges are apparently due to 
age. 
The ventral longitudinal muscles in a large example are somewhat ovoid in section, 
and their massive inner edges approach rather closely, so that the nerve-area is 
lengthened. The large neural canal lies below the cords, and the brownish granular mass 
fills up the region above them. The nerve-area proper shows superiorly two fibroid regions 
surrounded by a granular belt which also invests the neural canal. Certain of the vertical 
and oblique fibres are inserted above the nerve-area, while others (oblique) pass down- 
ward by the side. In a small specimen the nerve-area was shorter from above down- 
ward, probably from the less developed condition of the ventral longitudinal muscles 
internally. 
The teeth in this species somewhat resemble those of Kinberg’s Eunice indica ^ from 
Banks Strait, but the longer and more distinctly moniliform appendages of the head 
diverge. The dorsal cirri are also boldly articulated, whereas they are smooth in 
Kinberg’s form. The bristles do not differ much. In the structure of the foot and in 
the large size of the dorsal cirrus Eunice torresiensis also resembles Eunice australis, De 
Quatrefages,^ but the great dental plates have four teeth in the latter. 
1 Ofversigt k. Vetensk.-Akad. Fdrhandl., 1864, p. 562. 
2 AnneEs, vol. i., 1865, p. 321. 
