108 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



Eunice afuerensis, new species 

 Plate 6, Figs, 127-134 



Collections. — 391-35 (5) ; 844-38 (many fragments, no anterior 

 ends). 



This is a large, robust form, the length of a complete individual with 

 550 or more segments is about 500 mm ; the body is long, tapers posteri- 

 orly. The prostomial structures are small, compared with the large, 

 overhanging peristomial ring (pi. 6, fig. 127) and provided with 2 dark, 

 circular eyespots near its outer posterior margin. The 5 prostomial an- 

 tennae are distinctly ringed, moniliform, taper distally, the longest or 

 median hardly surpasses the length of the peristomial ring. This one has 

 about 20 articles, the basal far the longest. Inner lateral antennae have 18 

 articles and the outer lateral ones have 15 articles. 



The first or peristomial ring is very large, wider than long, with a 

 transverse groove on its dorsal side, near its posterior end, where the cirri 

 are attached (pi. 6, fig. 127) ; the latter are over half as long as the 

 peristomium, taper distally, and are irregularly though closely ringed 

 (in the specimen figured the right cirrus is bifurcated). 



The first few parapodia are about as long as, but slenderer than, those 

 farther back; they are provided with a long, slender dorsal cirrus about 

 as long as the peristomial cirri and a ventral cirrus that is thick, triangu- 

 lar, resembling those farther back. The dorsal cirri decrease gradually, 

 but slowly, from the first parapodium posteriorly. Branchiae are present 

 from the third setiger, already with 6, or fewer, long, tapering, pecti- 

 nately arranged filaments (pi. 6, fig. 129), which are, however, greatly 

 exceeded in size by their respective dorsal cirri. By the fifth setiger the 

 branchia has 10 filaments, the twentieth has 16 filaments, but by the 

 fortieth the number of filaments is only about 14, and by the eighty- 

 fourth segment there are only 9 filaments. In another individual (pos- 

 teriorly incomplete), consisting of about 138 setigers, the branchiae still 

 have 6 filaments on the last setiger. Branchiae are continued to the pos- 

 terior end, with several (3 or 4) pectinately arranged filaments. 



All setal and acicular structures are translucent, pale yellow. The 

 first 29 or 30 segments are provided with composite hooks in which the 

 shaft is smooth, the appendage short, with slightly falcate tip and smaller 

 secondary tooth (pi. 6, fig. 134). Already in the twenty-ninth setiger, 

 composite hooks come to be replaced by stout, uncinate, simple, bidentate 

 hooks (pi. 6, fig. 133) in which the distal end is forked, the 2 prongs di- 

 rected slightly to the side. The composite hooks have gradually trans- 

 formed into a thicker, less clearly articulate form (pi. 6, figs. 132, 130) 



