96 ART. I. — A. IZUKA : 



cJ Tentacles 7 : 5 long posterior and 2 short anterior tentacles. 



fV . Tentacular cirri absent Hyalinoecia. 



d". With 2 tentacular cirri. 



e'. Gills pectinate or cirriform. 



/'. Anterior parapodia not carried forward to 



the ventral side oE prostomium . . Omiphis. 



/". Anterior two pairs of parapodia prolonged 



and carried forward to the ventral side of 



prostomium Paranorthia. 



e". Gills plume-like Diopatra. 



(■" . Tentacles 5 in all, gills distiüctly present, 



r/'. With 2 tentacular cirri Eunice. 



d". Tentacular cirri absent ^larphysa. 



c'". Tentacles 3 in all, gills absent Lysidice. 



c"". Tentacles 2 in all, gills branched . . . . CoelobrcmcJius, 

 h". Lateral halves of maxillary apparatus with same number of 

 jaw-plates ; prostomium without a true tentacle. 



c'. With gills Ninoë. 



c". Without gills Lumhriconereis. 



a". Parapodium uniramous, with bristles of simple kind only. 



h' . First pair of jaws with large terminal fang. All the 4 pairs 



of jaws similar Laranda. 



h". First pair of jaws without large terminal fang. . Notocirrus. 



Genu S Hyalinoecia Malmgren. 



Prostomium with 2 ant(3rior short, tliiclc, and 5 posterior 

 lono^ tentacles provided with ringed ceratophore. Peristomiiira 

 simple ; tentacular cirri absent. Eyes small, situated somewhat 

 behind and exterior to the jiiedian tentacle. Branchiae cirriform, 

 very rarely branched. Tube horny, rigid witl.iout foreign 

 material, 



