24 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.15 



side; those near the middle of the series are the largest. There are 18 

 soft, terminal papillae, the largest on the ventral side. Macrognaths are 

 large and have 5 or 6 teeth, the largest at the dorsal end. Micrognaths 

 consist of a long, dorsal (fig. 4) and a short, ventral arc. The dorsal 

 arc comprises 12 pieces in definite arrangement including (from one end 

 to the other) one Y-shaped piece, 2 H-shaped pieces, one Y-shaped piece, 

 4 H-shaped pieces, one -Y-shaped piece, 2 H-shaped pieces and one Y- 

 shaped piece. Micrognaths and macrognaths together form a complete 

 circle. 



Proboscidial organs are coarse and numerous; they are distributed 

 more or less regularly over the surface of the proboscis. They are yellow, 

 translucent, hard, and stand moderately erect, presenting a prickly 

 appearance when the proboscis is everted. They are of one kind but some 

 are larger than others. All are disposed so that the large spine (figs. 9, 

 10) is directed orally. Each organ consists essentially of 2 hard, chit- 

 inized pieces; one is directed to the mouth and has a long projecting 

 spine; the other is opposite and lacks a spine but has a sharp node that 

 bounds the distal aperture. The 2 hard parts are held together by 

 softer lateral parts and the entire structure is penetrated by a canal that 

 leads to one or more large cells in the base. In general appearance these 

 organs differ notably from those in G. brunnea (see above) but the 

 differences are due largely to modifications of external parts. 



Parapodia are uniramous (fig. 2) through 35 to 43 segments. They 

 have long dorsal and ventral cirri that exceed the setigerous lobes in 

 length. The latter consist of an elongate, triangular postsetal, and 2 

 presetal lobes of which the superior is slightly longer than the inferior 

 one. Setae in these parapodia are entirely composite spinigerous. Acicula 

 are pale yellow; they occur singly in rami and do not project from the 

 parapodium. Biramous posterior parapodia (fig. 3) similarly have well 

 developed dorsal and ventral cirri but the first are the longer. Notopodia 

 consist of subequal presetal and postsetal lobes ; the presetal one is slightly 

 ventral in position. Notosetae are simple, slender and number 10 to 12 

 in a fascicle. 



Neuropodia in posterior segments have a bifid, presetal lobe in which 

 the inferior part exceeds in length the superior one; the postsetal lobe is 

 prolonged at its upper edge as a triangular process (fig. 3). Neuro- 

 acicula resemble notoacicula but are slightly thicker. Neurosetae are 

 entirely composite and have a spinigerous appendage. The shaft is 

 cylindrical but at its distal end it is hollowed out for the insertion of 

 the appendage. At its front margin (the side marking the cutting edge 



