REPORT ON THE ANNELIDA. 
211 
posterior pair, and they are better fitted for looking forward and outward. Each is 
slightly crescentic in outline. The posterior pair have the lens in the centre superiorly, 
and therefore look upward. The maxillae possess about eight teeth, besides the terminal 
fang. The paragnathi differ from those in Nereis dumerilii; group VII. and VIII. of the 
basal or oral ring in extrusion being formed by a tolerably continuous minute series in a 
curved granular row in each lozenge. The lateral dorsal series (VI.) of the same ring has 
the form of a double transverse row on each side. The series (IV.) at the base of the 
maxiUse interiorly form two somewhat triangular lateral groups and a median one (HI.) 
of smaller points. All these possess comparatively larger horny points than in Nereis 
dumerilii, and a different asjDect, though neither of the examples is favourable for minute 
description in this respect. 
The feet somewhat resemble those in Nereis dumerilii, with the exception that those 
with the rounded lobes stretch from the fifth to the eleventh. The tenth foot 
(PL XXXIV. fig. 4) presents three prominent rounded lobes, the superior being more 
oblique in its outline ventrally than dorsally. The superior cirrus is rather more than 
three-fourths the vertical diameter of the foot, and stretches considerably beyond the 
upper lobe, while the ventral does not reach the tip of the lower lobe. The dorsal tuft is 
composed of a series of the ordinary bristles with comparatively short and boldly serrated 
tips (PL XVIa. fig. 2), and a single deep amber-coloured and characteristic hook 
(PL XVIa. fig. 3). The inferior division bears above the spine a series of bristles 
similar to those already described, and below it a group of falcate bristles, a few of the 
upper (PL XVIa. fig. 4) being larger than the others. 
As usual the tips of the spines are black, the superior touching the base of the 
peculiar hook, and the inferior surmounting the falcate bristles. 
The thirty-seventh foot (PL XXXIV. fig. 5) still exhibits three prominent lobes, but 
all are more slender and elongate than in front. At the base of the dorsal cirrus are two 
pigment-patches, and a third exists on the body at the origin of the foot. The superior 
lobe is somewhat conical in lateral views, while the middle and inferior approach a 
lanceolate form. These characters are slightly varied in the fifty-seventh foot, for whilst 
the superior and inferior lobes are longer, the middle is proportionally less. Two hooks, 
moreover, occur above the superior spine, and their elongate shafts project a consider- 
able extent beyond the cuticle. 
The special hooks in the superior division of the foot would appear to be related to 
the habits of the Annelid. A hyaline but somewhat tough tube occurred with it, and in 
all probability, like Nereis dumerilii and others, it inhabits this, and uses its hooks for 
fixing itself, either when withdrawn or during partial projection. The only other form 
(known to me) which presents a similar arrangement in the upper division of the foot is 
Nereis agassizi of Ehlers.^ 
’ Die Borsteiiwiiriner, Bd. ii. p. 542, Taf. xxiii. fig. 1. 
