190 BUSH 



the form of those in Ckone. Intermediate between those of Chone and 

 Euchone. 



(n) EUCHONE Malmgren 1865. 



Type, E. analis (Kroner 1856) Malmgren 1865, figures, as first species. 

 Spitzbergen. 



Branchiae joined by membranous web. Inferior setse on thorax, 

 below collar fascicle, subspatulate in form, i. e., short, tapered, widest 

 in middle. With caudal sucker. 



(12) METACHONE gen. nov. (See p. 216.) 



Type, M. mollis sp. nov., figures. Pacific Grove, California. 



Branchiae joined by membranous web. Inferior setae on thorax, below 

 collar fascicle, clavate in form, i. e., long, rounded, widest near upper 

 end. Uncini similar in form to those of Euchone. Without caudal 

 sucker. 



(13) PARACHONIA Kinberg I866. 1 



Type, P. letterstedti Kinberg 1866. Cape of Good Hope. 

 Branchiae joined by membranous web. Inferior setae on thorax, below 

 collar fascicle, clavate in form. Uncini unknown. 



(14) JASMINEIRA Langerhans 1880. 



Type,,/, caudata Langerhans 1880, figures. Madeira. 

 Branchiae free. Inferior setae on thorax, below collar fascicle, sub- 

 spatulate in form. Uncini avicular in form. 



(15) DIALYCHONE Claparedc 1870. 



Type, D. acustica Claparede 1870, figures. Gulf of Naples. 

 Branchiae free. Inferior setae on thorax, below collar fascicle, clavate 

 in form. Uncini somewhat similar in form to those of Sabellides Malm- 

 gren 1865 (Ampharetea), with smaller and more numerous teeth, the 

 lowest one larger than the others. 



Avicular uncini in tori on abdomen ; avicular uncini and pennoned setae in 

 tori on thorax. 



(16) PROTULIDES Webster 1884. " 



Type, P. elegans Webster 1884, figures. Beaufort, North Carolina, 

 and Bermuda. See p. 184. 



Branchiae joined by membranous web. Setae on collar in a dorsal, 

 oblique, linear series on each side. Inferior setae on thorax, below collar 

 fascicle, suborbicular in form. 



6. Collar with only one incision or cleft (two-lobed) y. 



6'. Collar with three incisions or clefts (four-lobed) 8. 



7. Collar with ends separated on back. 



Uncini only in tori on both thorax and abdomen. 



(17) LAONOME Malmgren 1865, non Kinberg 1866 nee Marenzeller 1884. 



Type, L. kroyeri Malmgren 1865, figures. Spitzbergen. 

 Branchiae free. Inferior setae on thorax, below collar fascicle, orbic- 

 ular in form. Uncini similar in form to those of Euckone. 



1 A thorough knowledge of this genus may render it necessary to combine it 

 with the preceding (Metac/tone). 



