28 Universitij of California PuhJicafious. [Zoology 



plumose setae; principal seta of the secondary branch greatly 

 dilated toward its distal end and about a third longer than the 

 next seta, which is, in turn, nearly double the length of the re- 

 maining three ; hooked appendage of male bent upon itself ab- 

 ruptly at the base, with the inner side of the extremity crenu- 

 lated. 



Distribution. Claus states that this form appears to be widely 

 distributed in the Atlantic Ocean at the surface as well as at va- 

 rious depths; Pacific Ocean off San Diego, California. 



