ANNELIDA FROM BERMUDA. 309 
the middle line of the body ; passing from this line outward they become 
somewhat narrower. 
Feet biramous; ventral ramus (Fig. 12) a little longer than the dor. 
sal, curved upward, tapering slightly from base to apex, bluntly rounded 
externally. It carries a finger-shaped cirrus which originates near the 
base of the ramus. Dorsal ramus (I*ig.i1) somewhat conical, truncated 
externally, and bearing a short cirrus, which arises near the center of 
the truncated surface. The two rami are very close to each other. 
Sete of the ventral ramus of two kinds, both compound; in the upper 
part of the bundle from two to six, elongate (Fig. 13), delicate, with 
long capillary appendix; all the others much shorter (Fig. 14), stouter, 
with short appendix. Sete of dorsal ramus (Fig. 15) from ten to fifteen 
in number, all of one kind, thin, pointed, flattened, widest near the 
center; they arise from the upper side of the ramus. ‘The anterior seg- 
ments curve forwards, forming semicircles. All the segments are very 
narrow. After the fifth segment the body has a uniform diameter to 
the posterior third, after which it tapers uniformly to about one-half 
the greatest width. The falling off in width is also rapid along the 
first five segments. | 
Color, in alcohol, pale light-yellow ; ventral surface yellowish, or red- 
dish-brown. 
Body slightly convex above; flattened below. 
Length (largest specimen), 50™™. 
Width, 3™™, 
Specimen only 10™ in length were also 3™™, or even 3.5™™, in width. 
Fam. POLYNOJD. 
WALOSYDNA Kinberg. 
Ofversigt Kongl. Vetensk-Akad. PGrhand., p. 384. 1855. 
HALOSYDNA LEUCOHYBA (Schmarda). 
(Plate VII, Figs. 16-18. Pl. VIII, Figs. 19,20.) 
Polynoé leucohyba SciumMarpDa. Neue Wirbellose Thiere, vol. i, part ii, p. 153, figures 
in text a, b, c, pl. xxxvi, fig. 308. 1861. 
Polynoé leucohyba QUATREFAGES. fist. Nat. des Ann., vol. i, p. 251. 1865." 
? Antinod leucohyba Bairpd. Linnean Society, Journal, vol. viii, p. 193. 
The width of the head, back of the bases of the antenne, exceeds the 
length (Fig. 16). The head is slightly convex above, with a central de- 
pression extending about one-half of the way back from the anterior 
margin; sides strongly convex; posterior margin straight; bases of the 
lateral antennee as long as the rest of the head. 
