FISHERY BULLETIN: VOL. 70, NO. 2 



always eight) is not considered as a diagnostic 

 character for this genus. 



Of great consequence for the systematics of 

 the Sabellidae is the opinion that the number of 

 lobes in the collar and the presence or absence 

 of a palmate membrane are specific characters 

 in Euchone. Therefore, they cannot be used for 

 dividing genera (cf. p. 459 and 461). The rea- 

 son is my opinion that the anal depression is of 

 monophyletic origin and therefore a primary 

 character, sufficient to characterize Euchone. 



EUCHONE ANALIS (KROYER) 



Figure 9a-c 



SABELLA ANALIS Kroyer, 1856, p. 17. 

 EUCHONE ANALIS.- Malmgren, 1866, p. 406; 



1867, p. 223.- Berkeley and Berkeley, 1952, p. 



121.- Pettibone, 1954, p. 339 (synonymy) .- 



Hartmann-Schroder, 1971, p. 521. 

 not EUCHONE ANALIS Imajima, 1963, p. 367. 



Diagnosis: A Euchone species with ventral 

 shields, with 16 to 22 anterior abdominal setigers 

 and 9 to 12 setigers in anal depression. Nine to 

 17 pairs of radioles united by palmate membrane 

 for half their length, with free ends tapered, in- 

 termediate in length; 5 to 10 pairs of ventral 

 nude filaments. Collar level, with slight ventral 

 incision, almost concealing the branchial basis. 

 Lower thoracic notosetae subspatulate. Uncini 

 from anterior and posterior abdomen similar, 

 with squarish bases. 



Material studied: Point Barrow, northern 

 Alaska, about 65 m. Identified by M. H. Petti- 

 bone (cf. Pettibone, 1954) . USNM 23651, 1 spe- 

 cimen. 



a-c, e-g 



FiGURK 9. — Euchorie analis: a, subspatulate notoseta; b, median uncinus from third 

 abdominal setiger; c, same, from 21st. Accessory teeth schematic; E. papillosa: d, an- 

 terior end of thorax, ventral view, showing staining pattern; e, bayonet-type seta; f, 

 spatulate seta; g, median uncinus from third abdominal segment; h, uncinus from an- 

 terior depression segment, approximately one and a half times enlarged over Figure g. 



482 



