Gatty Marine Laboratory, St. Andrews. 145 
‘The 20th foot (Pl. XII. fig. 26) has five lobes, four black 
spines and two winged hooks between the groups of brownish 
bristles. The lobes appear to be modifications of the pos- 
terior lobe seen in other forms. The dorsal division or lobe 
is considerably larger and more massive than the others, and 
the rest form a slightly diminishing series, the two lowest 
springing from the same basal stem. ‘The anterior lobe of 
the foot forms a truncated cone, the outline of which crosses 
the bases of the posterior lobes in lateral view. ‘The elon- 
gated hooks (Pl. XII. fig. 27) have a moderately developed 
winged region, a short neck, a small main fang, and several 
minute points on the crown. In Ehlers’s specimens only two 
black spines occur in this region. In Verrill’s N. nigripes 
the lobate processes extended only to the 28th foot. 
The 30th foot has six lobes, a dorsal considerably larger 
and longer than the others, a slightly diminishing series 
below, and a common trunk inferiorly which soon splits into 
two. ‘Their vascular supply follows the arrangement seen in 
front, viz., a large marginal vessel with transverse branches 
and meshes. The dorsal bristles form two groups—an upper 
with moderately tapered tips, and a lower with very attenuate 
tips. One of the second series of the dorsal bristles is shown 
in Pl. XII. fig. 28. These are followed by the two winged 
hooks, and, lastly, two bristles with somewhat short tips 
occur inferiorly, and there are three black spines. 
The 38rd foot has six lobes and two black spines; the 34th 
four lobes, two spines, and a hook; the 35th five lobes (the 
lower being small), one hook, and two spines. 
The lobes diminish to three in the 36th foot, viz., an upper 
and two small inferior lobes. The upper dorsal group con- 
sists of about two winged bristles with moderately elongated 
tips, a lower series (two or three) with elongated and very 
finely tapered tips, one or two hooks, and a lower bristle ; 
three spines are present. The 38th foot has only a single 
lobe and three black spines; two hooks are generally 
seen. The 39th foot has also a small lobe which becomes 
minute in the 40th foot, and both have only two black 
spines ; the tips of the hooks are now shorter. 
At the 50th foot only a blunt papilla indicates the upper 
(posterior) lobe. Dorsally the two kinds of tapered bristles 
are represented, and the winged hooks (three) are stouter 
aud have shorter and broader winged regions. A minute 
chief fang occurs, then above it a series of still more minute 
points—trom five to seven in number, 
Coincident with the change in the posterior lobes, the feet 
Ann. & Mag. N. Hist. Ser. 7. Vol. xi. 10 
