124 AUX. II. — A. IZÜKA : 



equal to that of the first segment, anteriorly deeply bilobed. 

 Eyes 2, large, purple, situated near the posterior margin of 

 prostomium. Tentacles all long, slender, tapering, faintly annulated, 

 the median reaching to the 13tli segment, the inner laterals to 

 the 11th, and the outer laterals to the 4th. Tentacular cirri loiiij 

 and slender, extending a little beyond the anterior margin of the 

 7th segment. 



Two long anal cirri equal the 9 last segments in length. 



Parapodium short, little tapering, truncate and somewhat 

 bilobed ; ventral cirrus with enlarged base, bearing small lobe-like 

 terminal piece (fig. 6) ; dorsal cirrus slender, sufficiently long to 

 reach the dorsal median line. 



Bristles of three kinds, all slender, delicate and colourless. 

 Firstly, compound bristles found in the ventral bundle ; shaft 

 curved, with an abruptly enlarged short end, serrated on one 

 margin ; the end-piece slender, elongated, with weakly hooked 

 and faintly bidentate end, the margin finely serrated, the guard 

 greatly prolonged into a mucronate tip equal in length to J or 

 more than J that of the end-piece (fig. 7). Secondly, very 

 slender, elongate, setose bristles. Thirdly pectinate bristles, 

 terminating with 9 or 10 teeth, of which the 2 marginal ones 

 are somewhat unequally prolonged. Posterior hooks with guarded, 

 trifid tip. 



Branchiae occur from the 5th to about the 36th segment ; 

 they appear on the 5th segment as a small process ; they are 

 elongate and simple on the Gth, become trifid on the 8th, and 

 have 4-6 branches on the 9th, 7-9 branches on the 11th, 14 

 branches on the 18th or 19th, which last number is retained 

 to about the SOth segment and then falls rapidly to 10, 7, 5 

 and none on successive so'anents. 



