EERANTIATE POLYCHAËTA OF JAPAN. 219 



Key to the genera found in Japan. 



a. ' PiU'apoclium miiramous or biramous ; tentacles alone present . . Euphrosijne. 

 a." Parapo:lium biramous ; jjotli tentacles and snbtentacles present. 



h.' Brancliiœ pinnate Ghloeia. 



h." „ arborescent Amphinome. 



hJ" ,, sliort and filiform or pinnate in cluster. Notopygos. 



Genus Bujyhrosyne Savigny. 



Body oval or oblong, equally narrowed at both ends ; 2 thick 

 posterior appendages. Prostomium with 1 or 3 tentacles, 2 or 4 

 eyes and a laterally compressed caruncle. Snbtentacles none, 

 Parapodium uniramous or biramous. Branchiœ consisting of a 

 series of branchial trunks, each bearing a number of branches. 



JEuphvosyne siiperha Marenz. 



PI. II, fig. 5 ; PI. XXII, figs. 1—2. 



1875. Euphrosj'ne superba, Marenzeller. 8üdjap. Annel., p. 2, Taf. T, 

 Pig. 1. 



Body oblong, yellowish brown, consisting of 45 segments. It 

 measured, in a living specimen collected at INIisaki, 54 mm. in 

 length and l(i mm. in maximum breadth excluding setae in the 

 middle parts of the l)ody. Setae and branchiae cover the dorsal 

 sui'face t)f body except a median longitudinal band of about 

 ^) nun. breadth. In the anterior 1)order of each segment, there is 

 found a small triangular area, with one of the angles pointing 

 Ijackwards. Dorsal surface of body finely wrinkled, and divided 

 by a shallow longitudinal groove into two lateral halves. 

 Caruncle al)ont 4 mm. long, fixed to the first 5 segments and ex- 

 tending to the commencement of Gtli segment, terminating with 



