232 U.S. NATIONAL MUSEUM BULLETIN 227 



an 



Figure 60. — Dorvilleidae, Stauronereis rudolphi (after Moore, MS.): a, dorsal view anterior 

 end; b, parapodium from middle region (setiger 33), anterior view; c, forked seta from 

 upper group neurosetae; d, compound seta from lower group neurosetae (compound 

 heterogomph falciger); e, left mandible;/, several maxillary teeth. 



contractile, shrinldng to 23 mm. in alcohol, Moore, ms.). Body 

 slender, linear, widest in middle, tapered toward both ends, flattened 

 ventrally, arched dorsally. Prostomium (fig. 60a) somewhat an- 

 nulated, divided into 2-3 more or less complete rings. Antennae with 

 5-12 articles. Anterior pair of eyes larger, situated between the bases 

 of the antennae and palps; posterior pair of eyes small, situated dor- 

 sally at the bases of the antennae (may be lacking). Anal segment 

 with 2 pairs anal cirri, dorsal pair longer, articulated. 



Maxillae of proboscis with 3 pairs larger plates more posteriorly, 

 radiating into 2 pairs of longitudinal rows of denticled plates, the 

 inner rows lighter, thornlike, with more numerous denticles, the outer 

 row heavier, V-shaped, with few denticles (fig. 60/; sometimes with a 

 third outer row of lighter curved denticled hooked plates). Color: 

 flesh, pale yellow or orange, with j^ellowish brown or red eyes, red 

 blood showing in long dorsal cirrophores of the dorsal cirri, the black 

 jaws showing through; at maturity, males pinkish, females grey 

 violet. 



Stauronereis annulata Moore is herein referred to S. rudolphi. It 

 is characterized by having some compound setae with very long 

 blades; this appears to be a variable character, perhaps associated 

 with the semipelagic character of the species. The extra long setae 

 may occur in small specimens or mature specimens. In a group of 

 13 specimens from Meadowdale, Washington, there were gradations 

 of the blades, the longest being 2 to 5 times longer than the shortest; 

 also the upper long simple setae varied in number from 3 to 14 or so. 



