220 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 7 



1914, pp. 237-240, fig. 1 (synonymy) ; Treadwell, 1914, p. 190; 

 Berkeley, 1924, p. 292. 

 Collection. — 889-38. One specimen. 



No data are available as to its association. Previous records report ft 

 commensal with pagurids. 



Distribution. — Northeast Pacific, south to southern California; Ja- 

 pan. Subintertidal, to 37 fms. 



Genus NEREIS Linnaeus 



Differs from Neanthes Kinberg in that the notopodial preacicular 

 lobes do not elongate; posterior notopodia are provided with falcigerous 

 setae. 



Key to Species 



1. Area V of proboscis with numerous paragnaths .... 

 A^. pseudoneanthes, p. 221 



1. Area V of proboscis with few or no paragnaths .... 2 



2. Areas VII and VIII of proboscis with few (5 or fewer) 

 paragnaths, disposed in a single row 3 



2. Areas VII and VIII with more numerous paragnaths . . 4 



3. Parapodial lobes with extensive dark areas, the posterior dorsal 

 lobe exceeds the middle lobe in size (pi. 33, fig. 37) ; pelagic 

 stages with 23 to 27 anterior atokal segments A^. riisei, p. 221 



3. Parapodial lobes without dark areas, the posterior dorsal lobe 

 not surpassing the middle lobe; pelagic stages with 32 to 38 

 anterior, atokal segments . . . . N. paucignatha, p. 222 



4. Posterior parapodia with falcigerous setae (pi. 37, fig. 65) re- 

 sembling those in Platynereis . . . N. pseudonereis, p. 223 



4. Posterior parapodia without such falcigerous setae ... 5 



5. Posterior dorsal parapodial lobes not longer than middle lobes 

 (pi. 35, fig. 53) 6 



5. Posterior dorsal parapodial lobes extend distally beyond the 

 middle lobes (pi. 37, fig. 69) 8 



6. Area V of proboscis with a single large paragnath that exceeds 

 all others in size ; prostomium and anterior segments crossed by 

 broken color bands A^. latescens, p. 224 



6. Area V of proboscis with no such large paragnath; pigmenta- 

 tion pattern otherwise, if present 7 



7. Posterior dorsal lobes dark, trapezoidal, broader than middle 

 lobes (pi. 33, fig. 36) 'N .neonigripes,'^.22'S 



