358 PERCY SLADEN TRUST EXPEDITION. 
with a longer serrated fork (¢c), in which the angle of divergence of the rami is not so 
great as in (d). Ventrally there is only the single type of smooth bifurcate seta, 
exactly similar to (4). All setee show at the apex the curious reticulate pattern which 
was noticed by McIntosh for C. fusca. Posteriorly the setee become much longer. 
The dorsal cirri are even longer than the dorsal bundle of sete, and the ventral cirri 
by no means so conspicuous. The caudal styles are developed as in the preceding species. 
It is very noticeable how closely this species adheres to the C. fusca type. The only 
differences from the original species are but trifling, viz., the coloration, structure, and 
arrangement of gills, and the absence of a single type of seta. 
Locality. Single specimen, Amirante, dredged from 30 fathoms. ‘“ Associated with a 
purple Alcyonarian.” 
4. Chleia maculata, sp.n. (Plate 45. fig. 4; Plate 46. figs. 1, 2.) 
Measurements. 13 mm. long and 4°5 mm. wide; no. of segments 20. 
The body has a fusiform shape, very similar to C. longisetosa. Intersecting diagonal 
striz ornament each segment on the dorsum, but the body is unpigmented save for a 
faint median dorsal line, on which is situated at the posterior border of each segment a 
dark purple spot (Pl. 45. fig. 4). The caruncle is rather small and the median tentacle 
equals it in length. The oval head bears two pairs of large black eyes. In front the 
lateral tentacles are about half the length of the median tentacle and tinged with 
rose-colour. The gills are small, and project backwards as in C. fusca, &c. The pinnate 
branches are better developed on the outer side of the main axis. 
The dorsal cirri are as long as the dorsal bundle of setze and contain a pink pigment. 
The setze are brittle and glassy, and resemble those of C. fusca, though not quite so much 
so as the last two species. The slender attenuate type of the dorsal bundle is absent 
here, as in C. rosea and C. longisetosa. Anteriorly the bifurcate sete show a distinct 
angle of divergence between the limbs of the fork, and a series of rather indistinct 
serrations on the inner side of the longer limb (PI. 46. fig. 1). Posteriorly the “ tuning- 
fork” type is developed, and with the appearance of serrations on the outer side of the 
limb those on the inner disappear. 
The ventral setze are of the usual type, save for the existence of strong serration on the 
inner side of the longer limb (Pl. 46. fig. 2). This is not confined to the anterior 
segments, but is met with throughout, though smooth setze also occur posteriorly. 
The anal cirri are rather longer than in the other species here described. 
The essential diagnostic character of this species contrasted with the rest of the group 
is the serration of the sete. 
Locality. Cargados Carajos, B15, 30 fathoms. 
Genus NOTOPYGOS, Grube. 
‘The species of this very homogeneous genus are unfortunately rather ill-defined. A 
great deal of importance has been attached to the presence or absence of serrations in 
the dorsal or ventral sete. Unfortunately, there appears to be a certain amount of 
