362 PERCY SLADEN TRUST EXPEDITION. 
7. Notopygos gardineri, sp.n. (Plate 45. fig. 8; Plate 46. figs. 6-8.) 
Measurements. Length 50 mm.; no. of segments 34. 
While affecting the fusiform shape common to all members of this genus, this worm 
differs from the preceding species in the rather flattened ventral surface. It is thus 
almost tetragonal in cross-section. A peculiar and characteristic appearance is imparted 
to the species by the long bristling tufts of sete, which, owing to their size and 
stoutness, present an even more formidable aspect than the dense thickets of NV. hispida. 
The body is for the most part bleached, but patches of brown pigment are scattered 
irregularly on the dorsum and in front of the dorsal bundles of sete. The dorsal 
segments have a rather characteristic ornamentation: beside the polygonal depressed 
area found anteriorly in each, the surface is cut up into lozenge-shaped areas by a 
number of diagonal and circular wrinkles. 
The caruncle (P]. 45. fig. 8), which just reaches the sixth segment, is remarkable 
for its regular elliptical shape, for the great height of the compressed median crest, 
and for the large number and the close-set nature of the transverse folds of which 
it is composed. The individual folds are narrow and not grooved, as is the case in 
other species. Rather broad smooth pigmented areas separate the median crest from 
the lateral folded portions, and otherwise the cream-coloured caruncle is only relieved 
by a line of brown pigment running along the ridge of the crest. 
The head, on which the median part of the caruncle impinges, though hardly in 
so marked a manner as in JX. variabilis, is hexagonal in shape. It carries two pairs 
of equal eyes and a median tentacle about 3 the length of the caruncle (and so 
better developed than in the other species described here), slender and tapering to 
the apex. The lateral tentacles and palps are but slightly shorter. 
The branchize occur in spreading tufts of a similar arrangement to those of the 
last species, but rather smaller proportionately. The slender branchial cirrus exceeds 
them in length. 
The dorsal sete are arranged in fan-shaped groups in each segment. They are 
yellow in colour and remarkable for their great size and solidity. Anteriorly the 
sete are shorter and are of a bifurcate type, with the rami of the fork diverging at 
a distinct angle. In the first two segments there is a distinct serration developed on 
the inner side of the longer ramus, three or more strong notches being visible in most 
(Pl. 46. fig. 6). Posteriorly, these are succeeded by a smooth type of seta, with the 
increase in length becoming bayonet-like in form, the longer ramus being continuous 
with the shaft of the seta and the spur-like smaller ramus not diverging noticeably. 
Two extreme varieties of the posterior set are here figured (Pl. 46. fig. 7, 8). 
The ventral setze are, as usual, shorter than the dorsal, and are throughout similar to 
the anterior kind of dorsal seta, with a rather widely divergent fork. The first three 
segments contain serrate setae, which are generally triserrate in the first segment and 
bi- or uniserrate in the next two. Thus in both dorsal and ventral divisions of the 
parapodia setze of a serrate type occur, as in V. megalops, McIntosh, from Bermuda. 
The anus occurs on the dorsum of the 24th segment as a rather noticeable papilla. 
Locality. Amirante Is., E 9, 84 fathoms. ‘ Pores and cavities in coral rubble.” 
Chiwia fusca was found in some quantity in the same dredging. 
