KEPORT ON THE ANNELIDA. 
229 
ventral lozenge. The double dorsal elevation of the same ring shows only a single tooth 
(V.), which is nearly, but not quite, median. A single minute central one (III.) occurs 
on the elevation between the maxillae (when withdrawn). The inferior lateral maxillaries 
(IV.) are absent. The maxillae have eight or nine teeth, the two distal being small. 
These characters are uniform in both large and small examples. 
The tenth foot (PL XXXV. fig. 14) has much larger lobes than in Nereis dumerilii. 
From the outer slope of a prominent elevation at the base of, and as long as, the superior 
lobe, a dorsal cirrus arises and extends outward considerably beyond the tip of the region. 
The latter is regularly lancet-shaped, with a distinct constriction at the base. The 
second lobe, which has a small accessory one at its base, is ovato-lanceolate, and does not 
reach so far outward as the first. The inferior setigerous lobe is comparatively short, 
and its free margin slopes from above downward and inward. Its tip scarcely reaches 
the middle of the second region. The ventral lobe is greatly developed, forming a large 
ovoid process, in this respect therefore being in marked contrast with the corresponding 
part in Nereis Icerguelensis. This lobe does not extend so far outward as the setigerous 
division above it, for the middle region of the foot, consisting of the second and third 
lobes, is much produced. The ventral cirrus arises from the margin at the base of the 
ventral lobe, and has only a slight elevation be 5 mnd the basal constriction. It extends 
two-thirds the length of the ventral lobe. 
The superior setose bristles (PL XVIIa. fig. 1, from the middle of the series) have 
somewhat short tips. The falcate forms again (PL XVIIa. fig. 2) show a distinct though 
rudimentary wing at the extremity, and the spines on the margin are long. 
The thirty-seventh foot presents a general extension of all the lobes (PL XXXV. 
fig. 15), the superior, second, and ventral especially forming elongated processes. The 
latter is now much longer than the setigerous division immediately above it. The 
ordinary setose bristles occur superiorly, while the falcate series in the inferior group are 
very strong. 
Two flat ovoid papilla, as usual, are placed below the anus, in the middle line above 
the bases of the caudal cirri. 
The relation of the large specimens of Dr. Baird’s Nereis magellaniea^ from the Strait 
of Magellan,^ presented by the Admiralty, is difficult to determine on account of the 
softened condition of the specimens, but in regard to the eyes, structure of the feet and 
bristles (which have shorter tips), it appears to differ. This is confirmed by an 
examination of a smaller form, somewhat less softened. 
A species in the British Museum, collected by Dr. E. 0. Cunningham in Peckell’s 
Harbour and Gregory Bay, differs from the foregoing in the structure of the eyes, feet, 
and bristles. It is probably undescribed. 
* British Museirm (59, 10, 28, 26). 
