Taken among holdfasts of kelp. (C. F. Baker, June 30, 1911.) Also a small specimen taken August 2, 1917, by Prof. Hilton.
Setae all simple, limbate, well developed. First two segments achaetous. Eyes none. Maxillae absent, but the mandibles normally developed, the wall of the alimentary canal opposite the latter simply thickened. Notocirri rudimentary.
The type as preserved is greyish brown of a dull bluish green cast. A note with the specimen also states that it is greenish in life. The body is strongly attenuated and pointed caudad, more moderately cephalad. The prostomium larger than wide and somewhat longer than the first two segments; subconically narrowed distad, apically rounded, flattened dorsoventrally. The two achaetous segments subequal in length or the second slightly longer, not produced forward below. Mandibles short and broad, not toothed, the edges meeting at an acute angle in front; the caudal stems shorter behind point of separation than the blades in front of this point, rather slender, blunt behind. Posterior lobes of parapodia subcylindrical, a little conically narrowed distad but with apex well rounded, extending ectad or caudoectad; in middle region of body reaching to or a little beyond middle of longer setae, the setae relatively shorter in anterior region. Setae all simple and limbate with the usual double curve, the first curve or angulation obviously less marked than in _A. lagunae_, which form this species superficially resembles. Number of segments in type, two hundred and seventy-seven.
Length, 92 mm.; width without parapodia, 2.2 mm.
Taken among Phyllospadix, September 17, 1917.
A small species easily recognizable among the known forms of the California coast by the character of the parapodia. Each of these present three lips, two anterior and one posterior; all three lobes triangular, pointed distad, with the posterior one fully equalling the other two in length. The neurocirrus is also triangular in outline. The natocirrus is reduced to a small rounded or nodular form slightly above base of parapodium. Branchiæ simple cylindrical filaments, each attached toward distal end of parapodium above as in _G. alba_ and _G. longipinnis_; the first occurring on or near somite XXX, short, in actual length not greater than parapodium exclusive of terminal lips and falling much short of reaching ends of setae; absent from last twelve segments or so and those just in front of this caudal region much reduced. Prostomium of usual general form; consisting of fourteen or fifteen rings. Proboscis long; weakly longitudinally ridged and densely finely papillose. Body strongly narrowed from the anterior region caudad, the caudal end slenderly pointed. Segments biannulate. Number of segments in the type near one hundred and thirty.