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portion (smooth in the figure) is covered with closely set 
rounded papille too small to be shown. —Prostomium, 
segmentation, annulation, parapodia, gills and nephridio- 
pores also shown. Natural size. 
Fig. 2. Anterior end of a littoral specimen about 
60 mm. long. Ventral aspect. In front the mouth is seen 
surrounded by a series of papille. Behind the “ upper 
lip” the three lobes of the prostomium are seen lying 
retracted in the nuchal organ. Note the metastomial 
erooves uniting in third annulus at anterior end of groove 
over ventral nerve cord. Segmentation and annulation in 
relation to the internal septa also shown. Compare from 
second to third chetigerous annuli with fig. 1. x 6. 
Vig. 3. Portion of * proboscis ” from fig. 1, to show 
the buccal papille, which gradually merge into the 
epidermal papille of the peristomium. x 9. 
Vig. 4. Chitinoid caps from the tips of the buccal 
papille. x 24. 
Figs. 5, 6. Dorsal and ventral views of the anterior 
end of a large littoral specimen, 340 mm. long. The 
“ proboscis ” is half extruded. ef. figs. 1, 2. 
Fig. 5. Dorsal aspect, showing the trilobed prosto- 
mium fully extended, the origin of the two metastomial 
grooves, the apertures of the otocysts, the sculpturing of 
the skin, &e. Each of the first four annuli is subdivided 
into two. ‘The first two annuli form the peristomium, the 
third and fourth represent a body segment from which the 
setee have disappeared. The first cheetigerous annulus and 
the following annulus represent the first cheetigerous 
segment. x 5. 
Fig. 6. Ventral aspect, showing metastomial grooves, 
groove over ventral nerve cord, and very small neuropodia 
of first cheetigerous segment. x 5. 
Figs. %, 8. Nerers pelagica. Dorsal and ventral 
