190 



BUSH 



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

 JEuchone. 



(11) EucHONE Malmgren 1865. 



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

 Spitzbergen. 



Branchiae joined bj membranous web. Inferior setse on thorax, 

 below collar fascicle, subspatulate in form, /. 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 Euckone. Without caudal 

 sucker. 



(13) Parachonia Kinberg 1866.1 



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

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

 collar fascicle, clavate in form. Uncini unknown. 



(14) Jasmineira Langerhans 1880. 



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

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

 spatulate in form. Uncini avicular in form. 



(15) DiALYCHONE Claparede 1870. 



Type, D. acusttca 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 setse in 

 tori on thorax. 



[ 16) Protulides Webster 1884. ' 



Type, P. elega7is 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) 7. 



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 nec Marenzeller 1884. 

 Type, Z,. i^rojer/ 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 {Metachone). 



