126 ART. II. A. IZÜKA : 



Compound bristles with curved shaft, which thicken very gradu- 

 ally to the end and has finely denticulated convex margin in the 

 thickest part ; the end -piece a relatively slender blade, • with 

 finely serrated edge and with prominent terminal teeth ; guard pro- 

 longed beyond the blade as a sharp spine about equal in length 

 to the width of the blade. Setose bristles straight or gently 

 curved, the terminal half very finely acuminate and the surface 

 feebly granulate. Pectinate bristles with about 12, slender, straight 

 teeth of even length and with one delicate prolonged marginal 

 process. Posterior hook (fig. 8) stout, rather strongly curved and 

 hooked, the principal beak- shaped process surmounted by an 

 unequally bifid accessory process ; guard wide, bilobed. 



Branchiae pinnate, the stem not reaching the middle line of 

 the back ; the stiff erect branches, arising at regular intervals of 

 about twice their own diameter, are subequal in length, shorter 

 and more slender than dorsal cirrus. Branchiae appear on the 

 5th segment and continue to exist to about the 37th, the maximum 

 number of branches in each branchia being 7. 



Habitat : — West of Niijima in Prov. Izu ; Sagami Bay, 63 

 fathoms, and Suruga Bay, 63-75 fathoms ("Albatross"). 



JEutiice gracilis Moore. 



PI. XII, figs. 10—11. 



1903. Eunice gracilis, Moore. Proc. Acad. Nat. Sc. Pliilad., Vol. LV, 

 p. 440. 



Body rather slender, very little depressed, with parapodia of 

 unusually great length. It consists of about 110 segments, 

 measuring about 50 mm. in total length and 4 mm. in breadtli 

 including para[)odia. 



