REPORT ON THE ANNELIDA. 
395 
;md being quite continuous with the central conical papilla at the ventral edge. A slit- 
like furrow occurs in the median line inferiorly above the papilla. On each side of the 
ridge is a broad shallow groove. The rest of the cephalic plate is marked (above or 
superiorly to the ridge) by transverse furj-ows, chiefly arranged with the concavity of the 
curve inferiorly. The margin of the cephalic plate is formed of the usual lamelliform 
process, which is most developed inferiorly on each side of the ventral median notch. A 
few slits occur in the margin above the anterior half, but the dorsal edge is smooth to the 
naked eye, though a series of fine crenations are visible under a lens. The buccal 
segm.ent is comparatively short. 
The succeeding segment bears only a row of bristles as in Maldane, and with the 
next six segments forms the first region of the body. These segments diminish in depth 
to the fifth, the sixth and seventh again increasing. All have more or less of a collar, 
the anterior third of the segment, that is the region in front of the rows of hooks, being 
of the usual white glandular aspect. The eighth segment also presents a narrow whitish 
belt, but it resembles the succeeding rather than the preceding rings. 
The hooks (PI. XX Va. fig. 11) present three very distinct teeth, and traces of a fourth 
above the great fang, the curve of the neck below the latter being carried abruptly 
outward to the vibracular eminence, so as to give considerable diameter to the region ; 
moreover, the crown and the adjoining region are carried backward, the neck curving 
forward to the shoulder. The vibrissae are of moderate length, and tolerably numerous. 
These hooks emerge through specialised apertures in the cuticle and hypoderm, the former 
presenting a ring round the aperture, and dipping inward to the shoulder of the hook. 
The bristles have no distinctive feature. Amongst the specimens from Station 
146 is a fragment apparently representing a reproduced tail. The terminal region forms 
a rounded projection directed ventrally, and has a soft conical papilla posteriorly. 
From the fact that at the base of the latter the last segment shows a row of hooks and 
bristles on each side, it is apparently an effort at reproduction. 
The greyish creamy material in the intestine of the specimen from Station 157 
consisted almost entirely of Diatoms of various kinds, some yellowish cells and granules, 
a Eadiolarian or two, and an infinitude of fine siliceous threads, connected, perhaps, with 
the latter or some other group. The contents of the alimentary canal of the example 
from Station 1 52, again, present a distinct modification, for while the Diatomaceous element 
remains much the same, even as regards species, there are not quite so many of the loug, 
siliceous hairs, and the Radiolarians are in greater abundance. The yellowish cells and 
granules probably pertain to the latter group. The whitish mass in the canal of the 
specimens from Station 146 altogether differs from the foregoing, for though Diatoms are 
tolerably abundant, Foraminifera, especially Glohigerince, are the main constituents, one 
or two minute Kadiolarians, and an occasional sponge-spicule only being present in the 
calcareous mud. 
