EREANTfATE POLYCHAETA OF JAPAN. 65 



Typical parapodium (figs. 12, 13) apparently uniramous, its 

 distal lialf nearly cylindrical, broadest at base, antero -posteriorly 

 compressed. Ventral cirrus arises from mid-ventral border of 

 para})(i(lium, provided with indistinct basal joint, about half as long 

 as ventral setae. Dorsal cirrus arises nearer to body than to origin 

 of ventral cirrus, reaches to about the tip of ventral setae tuft ; 

 the ciri'iphore provided with a leaf-like appendage on dorsal side ; 

 the style with indistinct snbterminal bulb ; the terminal filament 

 short. Dorsal ramus of parapodium represented by a thick tuft 

 of liair-like setae, with finely pinnate terminal portion (fig. 14). 

 Ventral setae strong, yellowish, with terminal undivided hook about 

 23 rows of fine and densely arranged spikes (fig. 15) below tip. 



Proboscis large, muscular, about twice as long as broad, with 

 9 tooth-like and long papillae on both dorsal and ventral lips. 

 Jaws in two pairs, dark-brownish in colour. 



Habitat : — Eboshi Iwa, in Chichijima (Peel Island), one of the 

 Ponin Islands (Mr. S. ITiiiota). 



Family Acoetidae. 



Prostumium witliout facial tulxTcle. Tentacles 3, or none. 

 Sii1»t('iitacles long, tapci'iug. Podv elongate, flattened. Elytra 

 numerous. Elvtra-lu'ariiig segments alternating witli those bearing 

 cirri. ri'oliosei-^ ])i'()lriisil)le, with numerous papillae on the lips; 

 the nie(lian dorsal and Ncntral pa[>illa tentaculiform. 



Key to the genera found in Japan. 



o' . Ommatophoro distinct; t(>iitiiclos 3 Pantholls. 



<i". Oiumaü^plioro iiulistimtt ; tentacles absent Restio. 



