chamberlin: pacific coast polychaeta. 255 



anteriorly, without distinct ocular peduncles. Eyes on dorsal surface, the 

 anterior farther apart than the posterior from which it is separated by about 

 its radius. Median tentacle very short, clavate. Facial ridge remarkably 

 long, much exceeding the prostomium in length, acutely narrowed anteriorly. 

 Elytra large, overlapping in middle line. Dorsal felt abundant and dense, 

 greyish brown, normally involving and dorsally concealing the neurosetae in 

 dorsal view. Number of somites, thirty-seven. 



Length of body proper, 33 mm. ; length over all, 38 mm. Greatest 

 width to bases of parapodia, 12.5 mm. Width to tips of neurosetae, 

 24 mm. 



Locality. — Calif.: Mendocino (A. x\gassiz). 



Type.— M. C. Z. 14. 



Nepthydidae. 

 9. Nepthys caeca (Fabricius). 



Nereis caeca Fabr., Fauna Groenlandica, 1780, p. 304. 



Two specimens from the Gulf of Georgia, Wash. (A. Agassiz). 



Nereidae. 

 10. Nereis californica Ehlers. 



Borstenwurmer, 1868, p. 553, pi. 23, fig. 2. 



Ehlers founded this species on a single incomplete specimen taken 

 by Mr. Agassiz at Mendocinch In the collection I find several 

 additional specimens taken at this locality at the same time. 



Type.— M. C. Z. 40. 



11. Nereis procera Ehlers. 

 Borstenwiirmer, 1868, p. 557, pi. 23, fig. 2. 



Taken in Gulf of Georgia, W^ash. 

 Type.— M. C. Z. 155. 



