8 Journal of Entomology and Zoology 
broad. Palpi thick the ectal lobe small as compared with the principal or mesal one; 
united only at base. Eyes small, transversely elongate and often curved, the two on 
each side close together and sometimes almost fused, with the posterior one well mesad 
of but only a little caudad of the anterior one. Median tentacle situated midway 
between the two eye groups in a longitudinal furrow dividing prostomium; composed 
of eighteen to twenty-three short articles. Each paired tentacle at corner of pro- 
stomium in front of eye-group of corresponding side; similar in form and size to the 
median tentacle. Lower tentacular cirrus about equalling a tentacle in length, the 
dorsal longer, both of similar form. First segment extending forward in a rounded 
or subtrinagular lobe or flap at middle above. The notocirri attached above bases 
of parapodia as usual; long, composed of numerous short segments; much longer 
than the tentacles, each average one when laid back along body ordinarily passing 
over three or three and a half segments. Neurocirri short, stout, fusiform. Body 
slender, narrowed moderately at the ends, elsewhere of nearly uniform width. Type 
composed of seventy-three segments. 
Length, near 20 mm. 
Type—M. C. Z. 2, 148. 
Littoral zone. 
Pionosyllis lucida sp. nov- 
Readily differentiated from P. elongata, which it resembles in its pale, translucent 
appearance, in having the distal appendage of setae more typical, being of a decidedly 
more elongate and erect form which also differs from that of pigmentata. From the 
latter differing conspicuously in appearance in lacking all dark pigment. Notocirri 
tapering distad, with apical region slender and pointed; long, exceeding the width 
of the body and consisting of up to forty-five articles. Differing from pigmentata in 
the form of the neurocirri which are more uniform in diameter, subcylindric rather 
than fusiform; normally extending more or less beyond the tip of the parapodium. 
Prostomium short. Eyes reddish; those of first pair larger than the second; second 
eve on each side almost directly mesad of the first but only a little caudad of it. The 
median tentacle farther forward than in pigmentata, well in front of the eyes, its 
anterior edge being nearly in line with the caudal margins of the paired tentacles; 
composed of twenty-eight or more short articles. Paired tentacles much shorter and 
zlso more slender; composed of about twenty articles. Palpi fused at base as usual; 
narrower distally than in pigmentata. ‘The types are incomplete caudally; but the 
body is evidently slender. One specimen 8 mm. long consists of forty-three segments ; 
and a second, somewhat thicker one, of nearly the same length consists of thirty-seven. 
The width is near 1 mm. 
Type—M. C. Z. 2, 180. 
Hesperalia gen. nov. 
Palpi thick, fused at base only to middle of length. Pharynx straight. Pro- 
boscis unarmed (?). Tentacles three, attenuated, more or less obviously jointed. Eyes 
two pairs; large. Tentacular cirri two pairs. Parapodia uniramous with setae all 
compound, or in the epitokous phase with long simple natatory setae in notopodia of 
middle region of body. Appendage of compound setate short, bidentate. Neurocirri 
present, thick, rounded. Notocirri on side of body above parapodia; filiform; more or 
