176 Proceedings of the Biological Society of Washington. 



tomium; subulate, with smooth outline, with only obscure indications of 

 annulation or none at all, when present these in distal half. Notocirri 

 slenderly conical, segments few and usually only weakly separated. An- 

 terior neurocirri very large and thick with a much reduced terminal article; 

 becoming slender in going caudad. Anal cirri two, attached close together 

 on ventral side of the circular anal opening, stout and showing a division 

 into four or five long articles. The remaining portion of the border of anus 

 shows about a dozen weak crenations. Maxillae pale excepting anterior 

 and mesal margins of carriers of I, which are black, and the teeth of the 

 other plates, which are brown. Right plate II with about thirteen teeth, of 

 which the most proximal are much smaller than the others; ectal left 

 plate II with about thirteen teeth, of which the most proximal are much 

 smaller than the others; ectal left plate II with long smooth proximal 

 edge distad of which are five or six teeth; unpaired or mesal left plate II 

 with seven teeth; right maxilla III with eleven teeth; left maxilla III also 

 with ten or eleven. Number of segments one hundred and twenty-seven 

 to one hundred and forty. 



Length up to 110 mm.; greatest width, 4.5 mm. Body strongly tapering 

 caudad. 



14. Leodice valens Chamberlin. 

 Previously known from Mendocino, Cal. 



LUMBRINEREIDiE. 



15. Lumbrinereis erecta Moore. 



Proc. acad. sci. Phil., 1904, p. 490, pi. 37, f. 19-22; pi. 38, f. 23-25. 

 A common species in this region. 



1(1 Lumbrinereis zonata Johnson. 



Proc. Boston soc. nat. hist., 1901, p. 408, pi. 9, f. 93-100. 

 Many small specimens probably the young of this species. 



17. Arabella munda Chamberlin. 



Several specimens agree well with the type, which was taken at Mendo- 

 cino. In these the right maxilla II is even more strongly dentate than in 

 the type, the number in one specimen being fourteen or fifteen, of which 

 two ordinary teeth lie distad (i. e. t ectad) of the large anterior fang-like 

 tooth. In this feature, according to Treadwell's description, differing 

 strongly from A. attenuata. 



DORVILLEID^E. 

 18. Dorvilleia moniloceros (Moore). 



Stauronereis moniloceros, Proc. acad. sci. Phil., 1909, p. 256, pi. 8, f. 

 24-29. 



Three specimens. This is the type locality for the species. 



