NEREIS DUMERILIL 305 



Anteriorly greyish-brown grains are mingled with the yellow. In preserved specimens 

 the two opaque, brownish, granular, glandular bodies on the dorsum of the foot are 

 visible about the tenth foot, and are very conspicuous posteriorly, where one or two dots 

 also occur on the side above the foot. Ventral surface greenish anteriorly, the rest being 

 similar to the dorsum, but without the white grains. 



The proboscis (Plate LX, figs. 10, 10 a, and 10 6) has two slightly translucent 

 maxillae, like amber, with six teeth pointing or sloped distally. The paragnathi are com- 

 paratively feebly developed, and they become very indistinct in some after long preservation 

 in spirit. On the dorsum of the organ in extrusion are two patches (VI) in front of the 

 palpi, each composed of about two rows of minute points. No teeth occur on this surface 

 in the maxillary division at the base of the jaws in the ordinary examples, but in the 

 epitokous forms (Plate LX, fig. 10 b) a short double row of small paragnathi (II) are met 

 with on each side. On the ventral surface the proximal region of the organ presents two 

 rows of minute paragnathi (VII and VIII) at the outer end of each lozenge-shaped area, 

 whilst on the maxillary division a patch of oblique but parallel rows of similar minute 

 denticles (IV), the whole having a somewhat triangular outline, occurs near the base of 

 each jaw. In the middle line between these are two rows (III) of minute denticles. 

 Considerable variation is met with in the arrangement of the paragnathi on the various 

 areas. 



The first foot (Plate LXXII, fig. 4) has a long and proportionally large dorsal cirrus, 

 which extends fully a third of its length beyond the dorsal lobe. The latter is of an 

 elongated tongue-shape, slightly diminished at the tip. Beneath it and partly over- 

 lapping the setigerous lobe is a smaller elongate lobe, also diminished at the tip. A small 

 papilla occurs opposite the elongated lobe just mentioned. The setigerous lobe bears a 

 series of bristles with long tapering tips. The shafts have a single camerated band in 

 lateral view, and in the comparatively small bristle these are faintly marked. The sabre- 

 shaped tip is not much tapered and has a finely spinous edge. The ventral lobe projects 

 considerably beyond the setigerous, but not so far as the two upper lobes. It also is 

 tongue-shaped, with a long inferior border. The ventral cirrus is smaller than the 

 dorsal, its tip reaching to that of the lobe above it, The foot thus differs from that of any 

 of the preceding species. A single spine, as usual, is present, 



At the tenth foot (Plate LXXII, fig. 4 a) the lobes have become more obtuse, the 

 upper being the more prominent, as the outline slopes from above downward and inward. 

 The edge of the foot from the body to the dorsal cirrus is longer and the ridge more 

 convex. The dorsal cirrus is still large, though less in proportion to the bluntly conical 

 dorsal lobe, which has considerably increased in bulk. A dorsal setigerous lobe or 

 papilla is now present, but, as it lies in front, is not included in the outline shown in the 

 figure. The lobe beneath is a massive blunt cone, its base overlapping the inferior 

 setigerous lobe, which is somewhat posterior in position. The latter has one long papilla 

 and a projecting edge inferiorly. The upper group of bristles has tapering and boldly 

 spinous tips (Plate LXXXI, fig 4), besides others with short tips, the spinous edge being 

 very short (Plate LXXXI, fig. 4a). A double line occurs below the hooked tip as if a 

 differentiation were indicated. Ehlers' figure differs from the condition in our examples. 

 The camerated central region is less distinct than in Nereis pelagka or N. eultrifera. 



96 



