ERllANTIATE I'OLYCHAETA OF JAPAN. 91 



Genus Sthenelais Kinberg. 



rroötoiniiiiii roundt'd anteriorly with a nucluil collar. A pair 

 of etenidia at basc^ (eeratophores) of median tentacle ; lateral 

 tentacles fused with iirst parapodium ; tentacular cirri more or 

 less separate. Subtentacles long, subulate, smooth, springing from 

 ventral surface of j)rostomium, but fusing with the first pair of 

 parapodia. A i)air of cttmidia at base of the first pair of parapodia. 

 Elytra covering dorsum, fringed. Dorsal and ventral divisions of 

 parapodium of equjd length. 



A well-developed branchial process on every parapodium. 

 Dorsal setae long, stiff, finely tapering, and spinous. Upper ven- 

 tral bristles with simple tip, boldly spinous ; next to them are 

 middle ventral compound bristles, at first with terminal-piece 

 of tliree segments, then witli same of one joint; and finally there 

 come lower ventral compound l)ristles with from one to four joints. 

 All the compound bristles are provided with bidentate ti}). 



SUtcnclais hon (.lohnston). 



ri. X, ligs. 0— 10. 



\Soo. 8jg;ilii)ii l)o;i, .Joliiistoii. JjoikI. ÎNlng. N;it. Jlist., ^'l, p. o2"2, fig. -I'i. 

 18io. ,, IduiiJie, n. Kiitlike. Nova Act. Acjul. Giesar. Nat. Cur., 



XX, I.IO. Tab. IX, fig. 1-S. 

 In") I. Sinralioii Iduiiao, (irube. Fiiiu. Aniiol., p. oîS. 



„ ,, hoa, W'illiaiii;-^. Ilcpl. lîrit. Assoc, 1851, p. 201. 



„ ,, Idtiuac, Sais. N} I. Mag. Natur., XT, o, p. 251. 



18<>."). ,, „ Mîdmgreu. NonL llafs.-Ann., p. Sfi. 



Stlioiielais Tdnnao and S. boa, Do (^uatrefagea. Auu., I, p. 27(1. 

 1805. Sigaliou lioa, .lohustuu. Oat. Brit. ]\[us., 121, ]il. l'î, fig. 0. 

 18Ü7. ., „ Parfitt. Auuel. Devon., p. ID. 



