74 
THE VOYAGE OF H.M.S. CHALLENGER. 
Tlie ventral area between the oblique muscles is large, and the nerve-cords seem to 
be minute, forming a small flattened band on each side, at the edge of the great longi- 
tudinal muscle of the region. This separation, with atrophy of the cords, is pecuhar, and 
merits further attention. The only doubt arises from the condition of the specimen, but 
this of itself could hardly cause the change, 
E'unoa mindanavensis, n. sp. (PI. XI, flg. 6 ; PI. XVII. flg. 6 ; PI. XIIa. 
figs. 7, 8). 
Habitat . — Trawled at Station 201 (in Basilan Strait, off Mindanao, one of the 
Philippines), October 26, 1874; lat. 7° 3' N., long. 121° 48' E.; depth, 82 fathoms; 
surface temperature, 83°‘0; stones and gravel, 
A fragment of the posterior end of a well-marked species furnished with whitish 
papillose scales. The diameter of the specimen is 3 ‘5 mm. including the bristles. 
The scales (PI. XVII. fig. 6) are pale throughout, somewhat ovoid, and densely 
covered wdth minute papillae, interspersed with larger ones, wdiich are quite visible under 
a lens. In front of the scar for attachment the papillae are for the most part small, 
though a few larger occur amongst them, especially toward the outer edge. The 
latter is furnished anteriorly with short stout cilia, which, however, as we proceed back- 
ward, assume a sj^inose form. By transmitted light these blunt spines present a central 
granular region, with a constriction in the middle, and a clavate upper part, the whole 
strengthened by the translucent chitinous deposit externally, and having at the tip a 
pair of short prongs, rarely more. 
The dorsal division of the foot bears a series of minute, pale bristles, strongly curved, 
the tips being acutely pointed and furnished with very fine (almost obsolete) serrations 
(PI. XIIa. fig. 7). 
The ventral series again consists of bristles Avith simple tips, which are pointed rather 
than hooked (PL XIIa. fig. 8, which represents an average example). The distal region 
is on the whole short and wide, and it is marked by very fine transverse striae from the 
obsolete spinous rows. 
The cirri, so far as can be ascertained from the fragment, are moderately elongated 
smooth tapering processes, with very slender tips. The ventral cmi extend beyond the 
bases of the bristles. 
The specimen is a male, the sperm-masses filling up the area beneath the alimentary 
canal, and, indeed, extending both laterally and superiorly. 
The nerve-area is small and almost spindle-shaped, as might be expected from 
its position. 
This form apparently approaches Griibe’s Polynoe am'pullifera} from Bohol, one of 
1 O'p. cit., p. 35. 
