ANNELIDS OF FAMILY NEKEIDAE — HARTMAN 



469 



Parapodia of anterior region low and rounded, their dorsal cirri 

 exceeding in length the dorsal lobes, their ventral cirri not greatly 

 longer than the ventral lobes (fig. 46, 5) ; in median parapodia the 

 setigerous lobes and cirri become relatively longer ; from the twenty- 

 first segment falcigerous homogomph setae appear singly in noto- 

 podia and continue so to posterior end; dorsal lobes in posterior 

 third of body broader, carrying dorsal cirri more distally ; posterior 

 parapodia with a conspicuously widened area of the middle portion 

 of the dorsal lobes (fig. 46, c), with dorsal cirri attached at end of 

 dorsal lobes. 



Figure 46. — Nereis (Nereis) eucapitis, new species : a, Anterior end in dorsal view, X 18 ; 

 6, twenty-fifth parapodium in anterior view, X 40 ; c, posterior parapodium, X 26 ; d, 

 falcigerous homogomph notoseta, X 333 ; e, falcigerous heterogomph neuroseta, X 333. 



Setae all composite, of the usual four types ; falcigerous notosetae 

 and neurosetae as in figure 46, d, e. 



Anal cirri two, as long as a posterior segment. 



Holohjpe.—U.S.'NM. no. 20198. 



Dlstrihution. — Duxbury Reef, north of San Francisco, Calif., south 

 to San Pedro, Calif. Common. 



Remarks. — In general appearance of "head" and parapodia this 

 species resembles N. cochhurnensis Augener, 1913, from Southwest 

 Australia. It differs from that species in its dentition, particuhxrly 

 in areas V, VII, and VIII. Among the Nereis (sensu stricto) from 

 California, it lies between N. vexiUosa and N. mediator. The pro- 

 portions of the prostomium and peristomium and the outwardly 

 curved dorsal edge of the dorsal lobe in posterior parapodia readily 

 separate N. eucapitis from other species of Nereis. 



