102 allan hancock pacific expeditions vol. 10 



Key to Species of Eunice 



A. Subacicular hooks pale, distally bidentate . (flavus-bidentate 

 group) 1 



B. Subacicular hooks dark, distally bidentate . (fuscus-bidentate 



group) 4 



C. Subacicular hooks pale, distally tridentate . (flavus-tridentate 

 group) 8 



D. Subacicular hooks dark, distally entire . (fuscus-unidentate 

 group) E. schemacephala, p. 121 



1. Prostomial antennae smooth, filiform; branchiae first present 



from about the twenty-sixth segment, and up to 3 filaments 



where best developed; subacicular hooks distally beaked (pi. 6, 



fig. 123) E. filamentosa, p. 107 



1. Prostomial antennae articulate to moniliform; branchiae first 

 present from a more anterior segment; subacicular hooks not 

 beaked 2 



2. Subacicular hooks and composite setae distally nearly straight 

 and almost equally bidentate (pi. 6, fig. 130) ; branchiae pres- 

 ent from third setiger nearly to the end, the first with about 6 

 filaments, increasing to 16 filaments where best developed; sub- 

 acicular hooks more or less completely replace composite setae 

 at about the thirtieth segment . . . . E. afuerensis, p. 108 



2. Subacicular hooks and composite setae with laterally placed 

 accessory tooth ; branchiae otherwise ; subacicular hooks much 

 less numerous, not nearly replacing composite setae ... 3 



3. Branchiae present from the third setiger, continued through the 



anterior third of the body or even to the middle 



E. longicirrata, p. 104 



3. Branchiae present from the third setiger, continued posteriorly 

 through about two thirds of body length . E. kobiensiSj p. 106 

 (perhaps identical with E. longicirrata) 



4. Subacicular hooks moderately dark, acicula paler than these; 

 branchiae first present from thirteenth setiger, with at most to 

 2 or 3 filaments E. guanica, p. 1 1 1 



4. Subacicular hooks dark or black 5 



5. Branchiae first present from about the nineteenth segment, in- 

 creasing to only about 2 filaments where best developed . . 

 £. rtMp. 110 



5. Branchiae first present much farther forward 6 



