190 BUSH 



PARALAONOME JAPONICA (Marenzeller) . 



Laonome japonica MARENZELLER, Siidjapanische Anneliden, p. 212, pi. in, 



figs. 4(A-c), 1884. 

 Sabcllastarte japonica SAINT- JOSEPH, Ann61ides de Dinard, p. 249, 1894. 



Type locality. Japan. 



Branchial lobes much prolonged ventrally, and spirally coiled in re- 

 traction, possibly unrolled in expansion, bearing 100 to no or more 

 moderately long branchiae arranged in two series, their wine-colored 

 rachises slender, four-sided, the two inner edges with closely crowded 

 yellowish pinnae. Eyes, if present, not discernible. 



Collar inconspicuous, four-lobed, the dorso-lateral incisions forming 

 small dorsal lobes separated by a deep furrow ; at the ventral fissure 

 simply rounded without angular ends. 



Number of segments about 200, of which 8 belong to the thorax, on 

 which the fascicles of setae, which are circular in form as in Sabella, 

 form very oblique series. 



Setae on all of the segments long, regularly tapered, of two forms, 

 narrow and broad. Avicular uncini only in all the tori. 



Length, without the branchiae, of a much contracted specimen 70 

 mm. ; breadth 10 mm. 



The above characters are taken from a specimen in the Yale Uni- 

 versity Museum, and agree well with those given by Marenzeller, 

 differing only in size and number of branchiae, stated by him to be 144. 



Genus Dasychone Sars 1861. 



Type, Dasychone decora Sars = ? Dasychone infarcta (Kroyer 

 1856) Malmgren 1865. 



The various species which have been referred to this genus vary so 

 greatly in the size and form of the branchial lobes, the size and arrange- 

 ment of the outer branchial processes, also the form of the collar, that 

 they need much careful study and separation, probably resulting in the 

 further division of the genus (see p. 192). 



Genus Dasychonopsis nov. 

 Dasychone MALMGREN 1865, in part. 



Type, Dasychonopsis pallidus sp. nov. 



The type (Z>. pallidus), in its small (not spiral) branchial lobes and 

 bilobed collar, agrees with Dasychone argus Sars, as figured by Malm- 

 gren (1865). Both are unlike D. infarcta (Kroyer), supposed to be 

 identical with D. decora, given by Sars in 1861 as his first species and 

 therefore taken as the type of the genus Dasychone. This has the 



