2l6 



BUSH 



generic name, especially as tliey may be easily broken or not mounted 

 in such a way as to show, and are consequently overlooked. 



Chone duneri Malmgren (1867), from Spitzbergen, is a slender 

 species, but is only half as long as the present one, with fewer, very 

 long branchiae having long, slender, naked terminal portions. Chone 

 infundibuliformzs ILroyer (1856), specimens of which from Green- 

 land are before me, is a short stout species, with conspicuously 

 marked segments and grooves, with very long branchiae which number 

 about 22 in each lobe. 



Genus Metachone nov. 



Type, Metachone mollis sp. nov. 



The setae on the thorax of M, mollis are similar to those of Dialy- 

 chone acustica Claparede (1870) from Naples, the type of the genus 

 Dialychone^ but the abdominal uncini are more nearly like those found 

 in species of JEuchone; while in D. acustica they more nearly re- 

 semble those of Sabellides Malmgren 1865 (Ampharetea), with the 

 lowest tooth larger than the others. 



METACHONE MOLLIS sp. nov. 



p1. XXXV, figs. 19, 20, 28. 

 Type locality. — Pacific Grove, California. 



A slender colorless specimen has lost a posterior portion, so that its 

 exact generic position is uncertain. The setae are similar to those of 

 Megachone aurantiaca Johnson (1901), but there are additional in- 

 ferior clavate ones on the thorax, which were not found in that 

 species. 



In the one branchial lobe preserved there are 17 branchiae, with 

 slender tapered tips and long delicate pinnae, connected for the greater 

 part of their length by a delicate web. 



Collar deep, with dorsal incision only, /. open on the back, with 

 ends in contact. 



Length of 8 thoracic and 10 abdominal segments 27 mm., breadth 

 2.5 mm. ; length of branchiae about 8 mm. ; length of thorax about 

 10 mm. 



The species described and figured by Verrill (1885) as Sabella picta 

 is a Metachone, 



Marenzeller (1890) recorded Euchone analis (Kroyer) Malmgren 

 from Bering Sea. It is possible that on further examination this may 

 prove to be a distinct species, more nearly related to M, ?nollis. 



