chamberlin: pacific coast polychaeta. 263 



with the margin opposite the teeth more strongly and evenly curved and the 

 body moderately widened and strongly rounded at end; bearing eight long, 

 slender teeth. Setigerous somites sixty. The achaetous appendage very 

 short. 



Length near 50 mm. Width across thorax, near 5.5 jnm. ; width 

 across opercular lobes to outer ends of paleoli, 8.8 mm.; to bases of 

 paleoli 5.5 mm. 



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



Type.— M. C. Z. 156. 



Cirratulidae. 



26. AuDouiNiA spiRABRANCHUs (Moore). 



Cirratulus spirabranchus Moore, Proc. Acad. nat. sci. Philad., 1904, p. 492, 

 pi. 38, fig. 26-29. 



Numerous specimens referable to this species were taken by Mr. 

 Agassiz at Mendocino and Crescent City. 



27. Cirratulus exuberans, sp. nov. 



This species is well characterized by its prostomium. This is short and wide; 

 the anterior margin wide, as a whole but moderately convex, indented on each 

 side of the middle so as to present three large, low lobes or crenations. An- 

 terior, more depressed, region crossed by a single series of eyes, the series 

 continuous, not interrupted in mid-dorsal region, and consisting of twenty-two 

 eyes of which the five in the mid-dorsal region are smaller than those on each 

 side of them. The peristomium dorsally divided into seven or- eight short 

 subdivisions by transverse sulci. The special dorsal branchiae in two dense 

 bands on the first setigerous somite, the two bands narrowly separated in the 

 mid-dorsal region, the branchiae in these groups nmnerous and, like the others 

 very long and forming a dense tangled mass. Other branchiae present nearly 

 to the caudal end, about the sixteen to twenty last segments, however, appear- 

 ing to, lack them. They are situated unusually high on the dorsum in the 

 posterior region, the space between them and the notopodia on each side much 

 exceeding the distance between notopodia and neuropodia, but in the anterior 

 region they come to arise close above the notopodia. Notopodia and neuro- 

 podia a nearly uniform distance apart throughout length, more ventrad than 



