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PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 83 



Jaws pale brown, horny at distal edge, without teeth but with 

 about eight shallow crenulations on the concave edge. 



Parapodia (fig. 53, a-d) of normal length in anterior part of body, 

 increasing in length in middle region of body and becoming as long 

 as width of body in posterior third; dorsal cirri in anterior para- 

 podia as long as, or slightly longer than, dorsal lobes (fig. 53, a^c) ; 

 in anterior parapodia the dorsal lobes and cirri diverge distally; 

 from about the twenty-first segment the posterior acicular lobe of 

 the ventral ramus develops a large saclike lobe (fig. 53, cZ), which 

 projects caudad; these lobes increase in size more posteriorly and 

 come to fill entire space between consecutive parapodia in last 12 

 setigerous segments. 



FiGUKE 53. — Nereis (Eunereis) longipes, new species : a, Prostomium and peristomium in 

 doreal view, X 26 ; 6j tenth parapodium in posterior view, X 40 ; c, dorsal cirrus 

 and dorsal lobe from twentieth parapodium, X 40 ; d, epitokousj parapodium from 

 posterior half of body in posterior view, X 40 ; e, falcigerous heterogomph neuroseta 

 from posterior parapodium, X 875 ; /, homogomph notoseta from posterior parapodium, 

 X 875. 



Setae with the usual heterogomph and homogomph pointed setae 

 and falcigerous heterogomph neurosetae (fig. 53, e) and homogomph 

 notosetae (fig. 53, /) in posterior parapodia. 



Anal cirri two, long, as long as last four setigerous segments. 



Eolotyj)e.—\].^.'^M. no. 20207. 



Locality. — From crevice in a large rock in 10 feet of water at low 

 tide in a cove at Moss Beach, San Mateo County, Calif. 



Remarks. — Nereis {Eunereis) longipes approaches N. (E.) hardyi 

 Monro from southern South America. It differs from that or any 

 other known species in head proportions, the ventral parapodial 

 lobes are relatively longer, and the neuropodial lobes of the posterior 

 parapodia are unique. 



U. S. GOVERNMENT PRlNTrNG OFFICE: 1936 



