ERRANTIATE POLYCHAETA OF JAPAN. 221 



Habitat : — -Misaki, under stones between tide-marks (!) ; Gulf 

 of Aomori in Prov. Mutsu (!) ; Yenoura in Prov. Suruga (!) ; Ko- 

 minato in Prov. Bösliiu ; Yenoshima (Marenzellek) ; Suruga Bay 

 (" Albatross "). 



Euplirosyne tnagnociilafa n. sp. 

 PI. XXII, figs. 12—15. 



Body oblong, pale white in colour but translucent, consisting 

 of 30 segments, 10 mm. long, and 3 mm. in maximum breadth 

 at about the middle of body excludina; bristles. Bristles and 

 branchia) cover lateral regions of body on dorsal side, leaving 

 exposed a median longitudinal region of about 4 the breadth. 



Caruncle about 1 J- mm. in length, its base reaching posteri- 

 orly to 4th segment, and its free posterior extremity to 5th 

 segment. Median tentacle cylindrical and slightly thicker than 

 dorsal cirri, distally abruptly diminishing in thickness and form- 

 ing a short terminal filament. Lateral tentacles absent. Dorsal 

 pair of eyes situated side by side between tentacle and caruncle, 

 very large and elliptical in outline, with long axis directed 

 antero-posteriorly. ^^entral eyes (PL XXIÏ, fig. 12) also very 

 large, oval in outline, the broader end directed anteriorly, and 

 about as long as dorsal eye. 



On each side of the carunck', tliere are found five dorsal 

 cirri belonging to tlie fa*st five segments. 



Mouth- opening bears on its anterior border two prominent 

 fleshy lobes (fig. 12) of a somewhat elliptical outline and of a 

 length nearly equal to that of tlie narrow cephalic lobe on 

 tlie ventral side ; breadth of the two bbes taken together is 

 about equal to the lengtli. The inner Ijorders of the lobes lie on 



