REPORT ON THE ANNELIDA. 
75 
the Philippines ; hut both scales and bristles differ, especially in regard to the serration 
of the dorsal, and the expansion of the ventral tips. In regard to the structiun of the 
bristles, it is somewhat allied to Malmgrenia. 
Eunoa yedoensis, n. sp. (PL XV. fig. 4; PI. XIX. fig. 9 ; PL Xa. figs. 11, 12). 
Habitat . — Procured at Station 232 (a little south of Yedo, Japan), May 12, 
1875; lat. 35° ll' X., long. 139° 28' E. ; depth, 345 fathoms; bottom temperature 
41°'l, surface 64°’2; green mud, in which several other families of Annelids were 
represented. 
A small and rather elongated species, about 1 2 mm. in length and 3 mm. in breadth. 
There are about forty bristled segments. 
The head (PL XV. fig. 4) is furnished with four very distinct eyes, two of which are 
placed wide apart at the posterior border, and a larger pair slightly in front of the lateral 
prominence. The latter are only fully seen from the side. The tentacle is absent. The 
antennse are rather thick at the base but tapered at the extremity. The palpi are com- 
paratively short, and have a filiform tip. The dorsal cirri are somewhat slender, and 
their tips are long and filiform. Beneath the latter the surface is covered with a number 
of somewhat cylindrical cdia, which toward the base of the cirrus become sparsely 
distributed and clavate. The ventral cirrus is subulate, and extends very slightly beyond 
the base of the bristles. The ventral papilla is a well-marked cylindrical process. 
The scales (PL XIX. fig. 9) appear to be fifteen pairs. They are covered with 
numerous rather distinct papdlse, and have on the posterior surface and edge a somewhat 
dense series of cilia, longest and most abundant at the outer border. These cilia corre- 
spond in outline with those on the dorsal cirri, being almost cylindrical. Toward the 
inner border posteriorly they are short, sparsely arranged, and clavate. Such are not 
common in the group. 
The dorsal division of the foot bears proportionally long translucent bristles, which 
have a remarkably extended smooth portion at the tip (PL Xa. fig. 11), the serrated 
region beneath comprising about eleven spinous rows. As the smooth portion at the 
tip considerably exceeds the spinous region in length, the latter is thus placed near 
the middle of the bristle. This form of bristle is peculiar and rare. 
The ventral branch, again, has a series of translucent bristles with rather short and 
broad tips, simply hooked (PL Xa. fig. 12, representing an intermediate form). The 
fine serrations on the edge are numerous and closely arranged. The setigerous inferior 
lobe slopes acutely upward from the ventral surface to the spine, thus giving a pointed 
character to the entire region. 
The nerve-cords are somewhat flattened. The area is comparatively narrow. 
