REPORT ON THE ANNELIDA. 
225 
lobe than in Nereis dumerilii. Bristles have tapering dagger-shaped spinose and 
falcate tips. 
A species closely resembling Nereis dumerilii. And. and Ed., and as it is 
fragmentary, a complete account is not obtainable. It is about the size of the species 
just mentioned. 
The head is similar to that of Nereis dumerilii both as regards outline and tentacles. 
The posterior long tentacles are absent, but the next stretch to the fourteenth foot. The 
paragnathi (VII. and VIII.) of the basal ring are somewhat larger than in the former 
species, and arranged in well-marked parallel transverse rows, two on each fold. The 
superior lateral (VI.) of the same ring are likewise in two parallel rows. The maxillary 
paragnathi (IV.) are also individually larger, but have a similar arrangement to those in 
Nereis dumerilii. No intermediate points (III.) occur between them. The maxillae 
exhibit about eight teeth. 
The tenth foot (PL XXXV. fig. 8) has a more pointed superior lobe than in Nereis 
dumerilii, and the superior tuft has one or two falcate bristles interiorly as in Nereis 
hdbiensis, though none of the tips are present. The extremities of the setose forms are 
less distinctly serrated than in Nereis dumerilii. Interiorly are the usual groups, none 
of the falcate kind having tips. 
The two superior lobes in the twenty-sixth foot (PI. XXXV. fig. 9) are somewhat smaller 
than in Nereis dumerilii, and the two falcate bristles in the superior group are present. 
The superior bristles have rather long tips (PI. XVIa. fig. 14), with a peculiar 
terminal curve and diminution. These tips are very finely setose. Posteriorly the 
falcate bristles of the superior group (PL XVIa. fig. 15) present a truncate tip. Those 
in the inferior division of the foot (PL XVIa. fig. 16) have a short terminal piece devoid 
of setae, but as in the former case furnished with a guard or wing at the tip. 
The intestine contains sandy mud, with a few sponge-spicules, bristles of Annelids, 
numerous fragments of Confervae, and other debris. 
The cuticular tissues are comparatively thin. The nerve-cords are somewhat flattened, 
and the median blood-vessel above them is largely dilated. The external fold of the ventral 
longitudinal muscles is large, passing inward beyond the median line. The perivisceral 
cavity contains cellular masses. The glandular wall of the alimentary canal is thick. 
This form is very closely allied to Nereis dumerilii and Nereis eatoni, and further 
knowledge of the variation in regard to bristles may alter the view of its separation. 
/ Nereis kerguelensis, Baird? (PL XXXV. figs. 10, 11, 12; PL XVIa. figs. 17, 18). 
Habitat. — Dredged off Kerguelen, in 10 to 100 fathoms. A variety occurred at 
Station 149e, to the west of Cape Maclear, Kerguelen, January 21, 1874; depth, 30 
fathoms ; sea-bottom, volcanic mud. 
(ZOOL. CHALL. EXP. — PART XXXIV. — 1885.) 
LI 29 
