AKT. 29 ANNELIDS FROM ALASKA TREADWELL 3 



and in somites 8 and 9 fomiing an indistinct patch rather than defi- 

 oite bands. Toward the posterior end of the body the broad dorsal 

 cirri are decidedly brown in color. 



Tiie fifteenth parapodium (fig. 2) lias a truncated neuropodial lobe 

 into the apex of which a single acicula extends. The notopodium is 

 represented only by a small rounded lobe and its acicula is somewhat 

 smallei- than that of the neuropodium. The dorsal cirrus has a stout 

 cirrophore, and the style extends about one-half its length beyond the 

 neul-opodium. The ventral cirrus is short and slender. In the para- 

 podium drawn there are six stout setae in the neuropodium and stubs 

 of three or four in the notopodium. 



A parapodium from somite 52 showed in general much the same 

 structure as the above (fig. 3) except that the dorsal ck-rus has a 

 broad flattened style, almost as large as sometimes occurs in the Phyl- 

 lodocidae. Some of these have small club-shaped processes visible only 

 under high power scattered over the surfaces. 



The ventral setae (fig. 4) are stout with ends entire and about 9 

 rows of toothed plates visible in profile as projecting teeth. I was 

 unable to find any unbroken dorsal setae, but the few fragments that 

 remain indicate that they have very slender shafts with numerous 

 transverse rows of delicately toothed plates. 



One anal cirrus remains. This is similar to the posterior dorsal 

 cirri in general form but is rather more slender. 



Type.— The unique holotype, Cat. No. 19139, U.S.N.M., was col- 

 lected in the mouth of Kotzebue Sound, Alaska, July 12, 1924, 12-17 

 fathoms. 



o 



